NXP backend: Updating converter flavor to SDK_25_12.

[jirioc]

Summary

The default converter flavor is updated to SDK_25_12 according to the newly released MCUXpresso.

Test plan

The unit tests are in place to test the new converter.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16338

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 2 New Failures, 1 Unrelated Failure

As of commit 1203eeb with merge base cf28248 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t c29f5d2b76a770f54deb2d4a161938df35d26f4d7015fc6483b985c4a5b66a9d /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t fe58738f4e3ea7b859a388862551f9ca284f1d63406fb2deb45af9fa27d688dd /exec failed with exit code 1

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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[jirioc]

This is a draft pull request. Don't merge before 1. The converter is published on eIQ pypi 2. The website for MCUXpresso SDK 25.12 is up and running 3. The CI of executorch-integration-github is green.