NXP backend: fixed docs in nxp-quantization.md

[novak-vaclav]

Summary

Fixed code snippets in nxp-quantization.md.

• there was an issue with faulty imports, where some kernels were not registered properly.
• added missing neutron_target_spec argument.
• here was another issue with the snippet for QAT. I fixed the code so it can be copy-pasted and run directly. I also removed the optional biasless convolution pass step. It makes the whole snippet quite misleading, since the example MobileNet does not have biasless convolutions, thus the code fails. I think the whole caveat is understandable from the last section about known limitations.
• fixed invalid link.

Test plan

No need to run tests, these changes affect only docs.

cc @robert-kalmar @JakeStevens @digantdesai @rascani @MartinPavella @roman-janik-nxp

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21464

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure

As of commit 3ca6a26 with merge base c6f166d ():

NEW FAILURE - The following job has failed:

• Test Vulkan Backend / test-vulkan / test-backend-linux (vulkan, models) / linux-job (gh)
  ##[error]fatal: unable to access 'https://github.com/NVIDIA/cutlass/': Error in the HTTP2 framing layer

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[linux-foundation-easycla]

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[roman-janik-nxp]

Rebased on recent main that includes fix for failing llama example in linux test check: c6f166d Fix test_text_decoder pytest collection collision

[roman-janik-nxp]

LGTM

[robert-kalmar]

@pytorchbot cherry-pick --onto release/1.4 -c docs

[pytorchbot]

Cherry picking #21464

The cherry pick PR is at #21472 The following tracker issues are updated:

• [v1.4.0] Release Schedule and Tracker #20552 (comment)

Details for Dev Infra team

Raised by workflow job