Fix LLaMA demo app.

[GregoryComer]

Summary: .

Reviewed By: mergennachin

Differential Revision: D77436093

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12079

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⏳ 13 Pending, 2 Unrelated Failures

As of commit 9442e4b with merge base cc3a35f ():

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_ring_attention.py::TestRingAttention::test_single_token_processing_quantized
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_ring_attention.py::TestRingAttention::test_single_token_processing_quantized

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D77436093

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[shoumikhin]

@pytorchbot merge -f "force sync with fbsource"

[pytorch-bot]

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[hinriksnaer]

Great work! Appreciate the help with this.