NXP backend: Extended support of HardTanh with new Neutron C flow

[StrycekSimon]

Summary

• Adjusted Clamp-related implementation for reuse in HardTanh as both operators share the same logic.
• Add new Neutron C flow support for HardTanh operator.

Test plan

Covered by newly added tests.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20177

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❌ 3 New Failures

As of commit f862141 with merge base c4e3db0 ():

NEW FAILURES - The following jobs have failed:

• pull / test-arm-backend-no-driver (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 9a4517a9fd4f3b42c4fdb8836ab05ab4f760b14248ff9863de02211f50517e2f /exec failed with exit code 1
• pull / test-openvino-linux / linux-job (gh)
  curl: (22) The requested URL returned error:
• pull / unittest-nxp-neutron / linux-job (gh)
  ../../dev/ir/converter/node_converter/test_hardtanh_converter.py::TestHardTanhNewNeutronFlow::test_custom_hardtanh_quant[False-False-activation_range7-input_shape1]

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[linux-foundation-easycla]

• ❌ - login: @StrycekSimon / name: Simon Strycek. The commit (602e8b8, ade8d31, b1d9d0d, c2005f2, cb37aa0, df0c240, f34c2b6, f862141) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.

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