NXP backend: Unify ExecuTorch and Neutron data format enums.

[MartinPavella]

Summary

Originally, the NXP backend used the NodeFormat enum to mark data formats (memory layouts) of ExecuTorch nodes, and the TensorFormat enum was used to mark the formats for Neutron IR tensors. However, these two classes fundamentally represent the same thing, and there is no need to keep them separated. Additionally, sometimes it was confusing as for which class to use which could result (and has resulted) in bugs.

This PR unifies these 2 enums into 1.

Test plan

N/A

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17066

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❌ 9 New Failures

As of commit d40397e with merge base 0b644f0 ():

NEW FAILURES - The following jobs have failed:

• pull / test-eval_llama-wikitext-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 377699979e9757829fc45c45f6dbfab165f4ac472d72dfd03ca0a2819c0d87d5 /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, xnnpack+custom+qe, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh)
  RuntimeError: Command docker exec -t 9caef93881c32ea7c546dd22223c97d6fb4d9586e6547a746dacf4316f261cf7 /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh)
  RuntimeError: Command docker exec -t e4d3fc6bb3c0f80d11b96163bed0fdeb17a7e919b96529ae1ddb0e0a196911ec /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu-22.04-... / linux-job (gh)
  RuntimeError: Command docker exec -t 91e3b21dba1ab818ac03518c29537380384ae4b8e679e6eb6ea2d3b000e507cc /exec failed with exit code 1
• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t b59f60857a3fb275a5a05a7c3f336a44f10f4da9c4fb4eaca00da545d19b71a6 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 0d96d7c1af4ddfe1036836a8c99703c72a5607ef4113feefbc86aed41bfaf378 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 01f516b82c74adacee9bf2083b5e1af903c9efb4e4773c0aead24c26620ea9ce /exec failed with exit code 1
• pull / test-static-llama-qnn-linux (stories_260k_bc) / linux-job (gh)
  test_llama_stories_260k
• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model

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[MartinPavella]

This PR depends on #17002, so only the last commit is relevant.

[MartinPavella]

The failing checks seem unrelated, and the internal build passed. Merging.