Arm backend: Update minimal example notebook

[AdrianLundell]

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11149

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❌ 1 New Failure, 3 Unrelated Failures

As of commit 4ed7bbd with merge base 3066463 ():

NEW FAILURE - The following job has failed:

• trunk / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 7cb98e35848165edb934bd64eb3abcfe9e6bd6332b0aa1690a49095b117c5bfa /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts

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[zingo]

Nxp and llama unit test fails are unrelated and happens on main also