AudioFlinger: Use audio_utils::mutex

Test: atest AudioTrackTest AudioRecordTest
Test: atest AAudioTests AudioTrackOffloadTest
Test: atest AudioPlaybackCaptureTest
Test: Camera YouTube
Bug: 298534151
Merged-In: Iba9e1e8f6d5f9ad2e31ea4e09598f2829ece3f02
Change-Id: Iba9e1e8f6d5f9ad2e31ea4e09598f2829ece3f02
11 files changed