Modify setter of audio buffer in HotwordTrainingAudio.

1. Modify setter (setHotwordAudio) to accept a byte[] instead of byte...
2. Document format of mHotwordAudio.

Bug: 298033849
Test: atest -c CtsVoiceInteractionTestCases:HotwordTrainingAudioTest
Change-Id: Idd23c0132d33d6616fa4e75b5945d7eec411128b
2 files changed