Arm backend: Populate __init__.py for quantizer and Arm root

[oscarandersson8218]

Populate backends/arm/quantizer/init.py and backends/arm/init.py

cc @digantdesai @freddan80 @per @zingo

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[digantdesai]

Oscar, this is causing issues internally since we didn't update the buck files. We may have to revert depending on how soon I can forward fix :(

Also for test/common.py we are using old import for ArmCompileSpecBuilder, also getting ImportError: cannot import name 'ArmCompileSpecBuilder' from partially initialized module 'executorch.backends.arm.arm_backend'

And we are not exposing is_tosa or get_tosa_spec from arm_backend.py through init, just an oversight?

cc @jackzhxng

[oscarandersson8218]

@digantdesai feel free to revert this if necessary.

I can fix the import in test/common.py but I'm not able to reproduce the ImportError. When are you seeing this error?

With regards to is_tosa and get_tosa_spec I don't think these should be exposed as they are helper functions for our testing rather than something an end user would use. But for sure, we can expose those as well if you think that looks better :)

[digantdesai]

Yeah I haven't looked into where the circular dependency is coming from.. this is when I try to update the buck files.

re. is_tosa etc. it might be OK but feel it is cleaner to import from one module namespace when they are in the same python file. We can move them into other file if you don't want to expose them to the end users.

Also I see main, operators, quantizer, _passes have init.py, are you planning to refactor others beyond main and quantizer here?