NXP backend: Add NXP backend tutorial page

[StrycekSimon]

Summary

Adds tutorial page for NXP backend.

Test plan

Documentation built locally using Makefile without any problems.

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14850

• 📄 Preview Python docs built from this PR

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

❌ 3 New Failures, 11 Pending

As of commit 6b121d9 with merge base 0b748bf ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8002dd409e68c4dfc9cf5c45397a115d985b5ad7b01c0bcec440e162ce2d08fb /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model

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[github-actions]

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[StrycekSimon]

@pytorchbot label "module: nxp"

[mergennachin]

@pytorchbot cherry-pick --onto release/1.0 -c docs

[pytorchbot]

Cherry picking #14850

The cherry pick PR is at #14853 The following tracker issues are updated:

• [v1.0.0] Release Tracker #14288 (comment)

Details for Dev Infra team

Raised by workflow job

[StrycekSimon]

That merge was hella fast. 😀