[Android] Integrate QNN backend to LlamaDemo

[kirklandsign]

repro:

(specify QNN_SDK_ROOT first)

pushd examples/demo-apps/android/LlamaDemo
./gradlew :app:setupQnn
./gradlew :app:installDebug

[pytorch-bot]

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 4daef75 with merge base 5a57d63 ():

NEW FAILURE - The following job has failed:

• Android / test-llama-app / mobile-job (android) (gh)
  Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers

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

• Apple / build-frameworks-ios / macos-job (gh)

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@kirklandsign merged this pull request in f9b2415.