Arm backend: Enable parallel building on MLSDK emulation layer

[ArmRyan]

Change-Id: I857bad698f234d803cd930325d908a720f7433ab

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14993

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❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• Macos CI runners unavailable

❌ 5 New Failures, 37 Pending

As of commit 9477130 with merge base cc6cb83 ():

NEW FAILURES - The following jobs have failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 52bba3da48e3c011171b782e171dd8c55407c6e524f90af2958510471e602692 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 80fc86622de3082d8c5002cdfb14b2c4a7deaa24f5b0b0fba59f4bc0cdf6f021 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t 347cc935343ff5b6a8afdc23e6ab531369b0621093c6db98f017bc080a5ed2bf /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 721c27c23ceb6fd0c89335c504029c66300ccf8f07b6b3bf0831e383043ad589 /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t 4fb44c939d323eee65fe87273e4050ecc5550854e75c0cfbcf6ec092dcaaa5ad /exec failed with exit code 2

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[ArmRyan]

FVP Failure: #14998

[zingo]

MacOS test problems are unrelated as this is nver tester on those targets. I also se other complain of macos running resources in the CI

[zingo]

other test fails are also unrelated

[ArmRyan]

@pytorchbot cherry-pick --onto release/1.0 -c regression

[pytorchbot]

Cherry picking #14993

The cherry pick PR is at #15037 and it is recommended to link a regression cherry pick PR with an issue. The following tracker issues are updated:

• [v1.0.0] Release Tracker #14288 (comment)

Details for Dev Infra team

Raised by workflow job