NXP backend: Update neutron-converter flavor to SDK_25_12

[robert-kalmar]

Summary

Update the neutron-converter to SDK_25.12

Test plan

Using existing unittest

cc @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16648

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❌ 2 New Failures

As of commit d5999a0 with merge base 8887cfd ():

NEW FAILURES - The following jobs have failed:

• Lint / link-check / lint-file-size / linux-job (gh)
  RuntimeError: Command docker exec -t 2b11a20ffe9222098664ed96111b0d7c19b0f7b5369b87e00e5a9bb998cb31ff /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model

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