NXP backend: Extend NXP backend docs page, add partitioner and quantization

[roman-janik-nxp]

Summary

This PR updates NXP backend docs Readme.

Test plan

cc @robert-kalmar @JakeStevens @digantdesai

[roman-janik-nxp]

@pytorchbot label "module: nxp" "release notes: nxp"

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14942

• 📄 Preview Python docs built from this PR

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

❌ 6 New Failures

As of commit 7e81aad with merge base 29b98c3 ():

NEW FAILURES - The following jobs have failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 98aa71dc3e47297631295a19f00c83296bef0d7c12873cdd3e8de86a4f19d9a7 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 30255dda2cc58d6a013bcdaa75291181ad9c4959366512fabcd3d52531f649a8 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t a84a8f78b9c7635663b0eeb9a00d404345b608290b25fce7d301eaeec051ed67 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 919b9c0f96fff04bfae7124893a2d21b92651375dc7a7904d4085fcd78c4ce57 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model
• Test CUDA Builds / test-voxtral-cuda-e2e / linux-job (gh)
  RuntimeError: Command docker exec -t d0008cbd604c2b24c4f60a31c09f319b4d49e185027ec7e8b68eb110efc5d391 /exec failed with exit code 2

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[digantdesai]

Create a cherry-pick request following instructions on #14288. Thanks.

[roman-janik-nxp]

@pytorchbot cherry-pick --onto release/1.0 -c {regression,critical,fixnewfeature,docs,release,examples,testci} 3591604

[pytorch-bot]

❌ 🤖 pytorchbot command failed:

@pytorchbot cherry-pick: error: argument -c/--classification: invalid choice: '{regression,critical,fixnewfeature,docs,release,examples,testci}' (choose from 'regression', 'critical', 'fixnewfeature', 'docs', 'release')

usage: @pytorchbot cherry-pick --onto ONTO [--fixes FIXES] -c
                               {regression,critical,fixnewfeature,docs,release}

Try @pytorchbot --help for more info.

[roman-janik-nxp]

@pytorchbot cherry-pick --onto release/1.0 -c release 3591604

[pytorch-bot]

❌ 🤖 pytorchbot command failed:

@pytorchbot: error: unrecognized arguments: 3591604fdff5605a38a74222be908108ccbed78c

usage: @pytorchbot [-h] {merge,revert,rebase,label,drci,cherry-pick} ...

Try @pytorchbot --help for more info.

[roman-janik-nxp]

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

[pytorchbot]

Cherry picking #14942

The cherry pick PR is at #14997 The following tracker issues are updated:

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

Details for Dev Infra team

Raised by workflow job