NXP backend: added aten.sub operator support

[novak-vaclav]

Summary

adds support for aten.sub operator

Test plan

tests can be manually run using pytest -c /dev/null backends/nxp/tests/

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14514

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 2b59bbe with merge base 70ea661 ():

NEW FAILURE - The following job has failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t eaf0ec2ead7132f5dfde5093aef13cccf274e2f0edf12ce6093250692f0150c8 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[novak-vaclav]

@pytorchbot label "release notes: nxp"

[MartinPavella]

I mainly added small suggestions and tips (which will be applicable to any of your future ExecuTorch PRs).
Once the changes are implemented, LGTM.

[MartinPavella]

LGTM. Once the tests pass, we can merge,