Android use new prefill API, and skeleton for audio input

[kirklandsign]

Summary

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Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14136

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❌ 1 New Failure, 1 Cancelled Job, 2 Unrelated Failures

As of commit 05378f5 with merge base ccd9824 ():

NEW FAILURE - The following job has failed:

• Build Presets / windows (windows) / build (gh)

CANCELLED JOB - The following job was cancelled. Please retry:

• Build Presets / windows (pybind) / build (gh)

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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