Extend CPPCHECK scope to portable kernels

[perheld]

Remove the broad kernels/portable CPPCHECK exclusion and keep the remaining suppressions scoped to the portable tree.

Portable kernel entry points are referenced through generated registration tables, which cppcheck CTU does not see as direct C++ calls. Suppress the resulting unusedFunction reports for this tree.

Cppcheck also does not parse several ExecuTorch macro idioms used heavily in portable kernels, including empty macro arguments and printf-style macros concatenated into string literals. Keep those parser suppressions scoped to portable kernels instead of adding inline suppressions throughout the tree.

Fix small real findings by removing an impossible unsigned comparison and cleaning up unused test setup plus a stray comma expression.

Change-Id: I6279a123b487d32b5811fdbe46ae4f2e82dcabd5

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 4 New Failures

As of commit 9660c90 with merge base 7282106 ():

NEW FAILURES - The following jobs have failed:

• Cadence Build & Test / hifi-build / hifi4 (gh)
  Input required and not supplied: aws-region
• Cadence Build & Test / vision-build / vision (gh)
  Input required and not supplied: aws-region
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 4196da49adec7aa0cfe647864e24e8e89f7b7d0a122a2d9ec2d94d9c991cec76 /exec failed with exit code 139
• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh)
  RuntimeError: Command docker exec -t c84666888cc022f56a7cdeb4b951ee37428ef34d49de1b24553ecb7a24734255 /exec failed with exit code 92

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[Copilot]

Pull request overview

Extends the project’s cppcheck lint coverage to include the portable kernel tree by removing the broad kernels/portable/** exclusion and replacing it with targeted, portable-scoped suppressions, while also addressing a few small cppcheck findings in portable-kernel code/tests.

Changes:

• Remove kernels/portable/** from .lintrunner.toml cppcheck exclusions and add portable-tree-specific suppressions (e.g., for CTU-driven unusedFunction and macro parsing limitations).
• Fix a redundant/impossible unsigned comparison in portable copy/permute argument validation.
• Clean up unused test setup and remove a stray comma expression in portable reduce util tests.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
kernels/portable/cpu/util/test/reduce_test.cpp	Removes unused test variables and a no-op comma expression flagged by static analysis.
kernels/portable/cpu/util/copy_ops_util.cpp	Removes a redundant >= 0 check on an unsigned value after prior validation.
.lintrunner.toml	Enables cppcheck over kernels/portable/** and scopes necessary suppressions to that tree.

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