NXP Backend: Update Readme files

[robert-kalmar]

Update Readme files.

@mergennachin DO NOT CHERRY-PICK TO RELEASE. In order to limit PRs fixing the documentation, I will provide a manually created update once the #14892 is merged.
The Neutron SW version used on main, vs. release differs.

cc @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14896

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❌ 2 New Failures, 1 Unrelated Failure

As of commit b298a2e with merge base c62cbfe ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e67abbf035cc2bf395c7bf72c3be0f948e4211d6e92d02451ae005857716d5dc /exec failed with exit code 1
• Test CUDA Builds / test-voxtral-cuda-e2e / linux-job (gh)
  RuntimeError: Command docker exec -t 08746f729a5d1d09b2c9960bb10e384b11b2a03bc80cd46b798134eac5b2da41 /exec failed with exit code 2

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-vulkan-models-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[roman-janik-nxp]

Changes are ok, added a dot at the end of line and a space.

[roman-janik-nxp]

@pytorchbot label "module: nxp"