NXP Backend: Update eiQ Neutron SDK to 3.1.1

[robert-kalmar]

Test plan

Existing unit tests

cc @JakeStevens @digantdesai @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19668

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❗ 2 Active SEVs

There are 2 currently active SEVs. If your PR is affected, please view them below:

• Run pull request jobs on OSDC runners in shadow mode
• Rollout OSDC prod cluster in us-west-1

❌ 3 New Failures, 1 Unrelated Failure

As of commit dc6a2f8 with merge base f3387d0 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1
• pull / test-qnn-python-imports-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 874174980b3216c1fb5a85632d01deb512b78a0923a8d127bb21a011acd6e797 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_dq_conv2d_seq

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

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

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