refactor XNNPACK's ukernel config srcs

[pytorchbot]

refactoring XNNPACK's ukernel config srcs

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12453

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❌ 1 New Failure, 2 Cancelled Jobs

As of commit c6513aa with merge base de24489 ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t f29c24132676fe50db30dc403cff8f43c5264f4f394fe8a97b0ccdc1a042c494 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

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