NXP backend: Add support for 'aten::hardtanh' operator

[StrycekSimon]

Summary

Add operator converter for supported aten.hardtanh variants.

Test plan

Unit tests provided.

cc @digantdesai @JakeStevens @robert-kalmar

[pytorch-bot]

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❌ 2 New Failures

As of commit 89cf566 with merge base ec379da ():

NEW FAILURES - The following jobs have failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t c3b76a14a9d6898ec0d32fa87bae6180f689fd1db7aaab48fe129521513c1230 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_to_copy.py::TestChannelsLastTaggedReshapePass::test_quantized_to_copy

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[StrycekSimon]

@pytorchbot label "module: nxp" "release notes: nxp"

[digantdesai]

Looks good. Left a comment about tests.

[digantdesai]

The nxp unit-test is passing but I see other red signals. Can you make sure they are not related and also please rebase? Then we can merge.

[StrycekSimon]

I checked the red-signals and it seems to be unrelated to this PR.

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[robert-kalmar]

Tests seems OK.
The failures are infrastructure problems:

• pull / test-eval_llama-mmlu-linux / linux-job (pull_request) - failed to download hails/mmlu_no_train from HuggingFace/cache
• trunk / test-arm-cortex-m-size-test (bare_metal) / linux-job (push) - git checkout failure from https://git.gitlab.arm.com/tosa/tosa-reference-model.git

[robert-kalmar]

Applied the comments. Running the CI. If green, will merge.