Portable kernel fixes for sabaton tests

[JakeStevens]

Summary:
When running in Sabaton Zephyr Posix tests, the compiler complains for things like

foo >= 0 && foo < bar

when foo is unsigned.

Also avoid bringing in aten

Reviewed By: rascani

Differential Revision: D95834771

[pytorch-bot]

🔗 Helpful Links

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❌ 3 New Failures

As of commit ced87c0 with merge base 286ccef ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 297e4df0341425d46320538b9f98a8bb43bdf85f413ae6814ba4d59ca0ce3ef2 /exec failed with exit code 9
• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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[meta-codesync]

@JakeStevens has exported this pull request. If you are a Meta employee, you can view the originating Diff in D95834771.

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