NXP backend: handle tests of mlperf tiny keyword spotting

[novak-vaclav]

Summary

Enable and refactor MLPerf Tiny Keyword Spotting tests.

Test plan

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

cc @robert-kalmar @JakeStevens @digantdesai @rascani @roman-janik-nxp

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/22519

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❌ 4 New Failures, 2 Unclassified Failures

As of commit 8c50ba9 with merge base 0264212 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  pytorch_tokenizers
• pull / unittest-buck / linux / linux-job (gh)
  pytorch_tokenizers
• pull / unittest-editable / linux / linux-job (gh)
  pytorch_tokenizers
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 022905809b5c25bff6c457b575936a7a16be9494aced2d964d659a28aafd686c /exec failed with exit code 1

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build macOS Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found

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[linux-foundation-easycla]

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