Revise OP-TEE Shim with Task and new ELF loader

[sangho2]

This PR revises the OP-TEE shim to make it work with Task and the new ELF loader.
Most of its line changes is to move syscall handlers to Task.

Notable changes this PR has made include load_ta_trampoline and load_ta_context to
run a TA loaded by an external ldelf binary, run_thread_with_shim_ref to repeatedly
execute run_thread with a shim reference (single-threaded process only), and few other
safety/security improvements.

Note: This PR includes some placeholders which are implemented in a different PR.

[github-actions]

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

Click for details

--- failure method_parameter_count_changed: pub method parameter count changed ---

Description:
A publicly-visible method now takes a different number of parameters.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/method_parameter_count_changed.ron

Failed in:
  litebox_common_optee::LdelfArg::new now takes 1 parameters instead of 0, in /home/runner/work/litebox/litebox/litebox_common_optee/src/lib.rs:1087

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/inherent_method_missing.ron

Failed in:
  LinuxKernel::register_shim, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_platform_lvbs/src/lib.rs:386

--- failure auto_trait_impl_removed: auto trait no longer implemented ---

Description:
A public type has stopped implementing one or more auto traits. This can break downstream code that depends on the traits being implemented.
        ref: https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/auto_trait_impl_removed.ron

Failed in:
  type OpteeShim is no longer UnwindSafe, in /home/runner/work/litebox/litebox/litebox_shim_optee/src/lib.rs:182
  type OpteeShim is no longer RefUnwindSafe, in /home/runner/work/litebox/litebox/litebox_shim_optee/src/lib.rs:182

--- failure function_missing: pub fn removed or renamed ---

Description:
A publicly-visible function cannot be imported by its prior path. A `pub use` may have been removed, or the function itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/function_missing.ron

Failed in:
  function litebox_shim_optee::deinit_session, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:64
  function litebox_shim_optee::loader::prepare_registers, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:58
  function litebox_shim_optee::loader::allocate_guest_tls, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:14
  function litebox_shim_optee::loader::init_stack, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:37
  function litebox_shim_optee::get_session_id, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:73
  function litebox_shim_optee::set_ta_base_addr, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:91
  function litebox_shim_optee::session_id_pool, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:843
  function litebox_shim_optee::init_session, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:43
  function litebox_shim_optee::litebox, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:125
  function litebox_shim_optee::loader::load_ta_trampoline, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:23
  function litebox_shim_optee::loader::init_ldelf_stack, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:47
  function litebox_shim_optee::set_ta_loaded, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:80
  function litebox_shim_optee::loader::prepare_ldelf_registers, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:92
  function litebox_shim_optee::get_ta_base_addr, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/lib.rs:97
  function litebox_shim_optee::loader::load_elf_buffer, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:9

--- failure struct_missing: pub struct removed or renamed ---

Description:
A publicly-visible struct cannot be imported by its prior path. A `pub use` may have been removed, or the struct itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/struct_missing.ron

Failed in:
  struct litebox_shim_optee::loader::ElfLoadInfo, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-main/4b5a6bfa0a5b913b5433532efb29f4ec8452207e/litebox_shim_optee/src/loader/mod.rs:29