NXP backend: Add support for Cortex-M backend benchmarking

[roman-janik-nxp]

Summary

Adds support for benchmarking Cortex-M backend in NXP backend test pipeline.

Test plan

Tested on backends/nxp/tests/generic_tests/test_cifarnet.py. This feature is for benchmarking only, so no automatic tests were added.

cc @robert-kalmar @JakeStevens @digantdesai @rascani

[pytorch-bot]

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❌ 6 New Failures, 3 Unrelated Failures

As of commit 740ac9f with merge base 35adf60 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t bb3c661c2e71cfdabc8967d0dd0c12838217cc183c29216a6b40189d3414cb3c /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t c201ea74e94aa0e1357e75c65e4b1c83f8d46748f923711e33b3a38ac7eea282 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t f829cb0097ccb2becb137758f66c13415ba13557d3870e23431cc745a3de5c82 /exec failed with exit code 1
• Test NXP Backend / test-nxp / test-backend-linux (nxp_neutron_imxrt700_int8_ptq, operators) / linux-job (gh)
  RuntimeError: Command docker exec -t c30761dd26d34f57f04eb2886f988f64829186536b4828cd2c6b395902a5ef4d /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (trunk failure)
• pull / unittest / windows / windows-job (gh) (trunk failure)
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)

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[JakeStevens]

is this needed?

[JakeStevens]

why duplicate functionality across backends? it could be confusing having cortex-only stuff under nxp backend, in addition to cortex-m backend.

Can any missing functionality be implemented directly in cortex-m backend?