Revert "NXP backend: Enable initial unit tests workflow"

[digantdesai]

Reverts #10258

Tried mitigations with #11091 but needs more work.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11109

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 9edaf43 with merge base 0cf2d53 ():

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

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts

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[robert-kalmar]

@digantdesai please revert for now.
We found, our infrastructure blocks the connections from github agents.