[cadence][hifi] Fix cadence backend example for i.MXRT600

[robert-kalmar]

Summary

Fixing the build of the cadence backend example for i.MXRT600. Guideline updated to reference a particular NXP MCUXpresso SDK (25.12) and added selective kernel registration, based on model used as the full executorch op library exceeds the i.MXRT600 memory.

Fixes #16898

Test plan

TBD.

CC @mcremon-meta , @jirioc , @aliafzal

[pytorch-bot]

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• Rolling out OSDC (ARC) runners on pull workflow for PyTorch trunk commits

❌ 1 Awaiting Approval, 2 New Failures, 2 Cancelled Jobs

As of commit 6774d7c with merge base 36e8ed9 ():

AWAITING APPROVAL - The following workflow needs approval before CI can run:

• periodic (gh)

NEW FAILURES - The following jobs have failed:

• Cadence Build & Test / cpu-test / test-aot / test-aot (gh)
  backends/cadence/aot/tests/test_replace_ops_passes.py::TestReplaceOpsPasses::test_replace_transposed_conv_with_linear_0
• Lint / lintrunner (gh)
  >>> Lint for backends/cadence/executor_runner.cpp:

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / unittest / windows / windows-job (gh)
• pull / unittest-editable / windows / windows-job (gh)

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[robert-kalmar]

@mcremon-meta, as per discussion on #16898 filing this draft PR which fixes the build of the Cadence example in ExecuTorch. Not yet ready to be merged, as need to verify the example on i.MXRT600.