AudioFlinger: clean up ctor initialization

Test: atest AudioTrackTest AudioRecordTest
Test: atest AAudioTests AudioTrackOffloadTest
Test: atest AudioPlaybackCaptureTest
Test: Camera YouTube
Bug: 298529417
Merged-In: Idd3be2e20eb90dff7f794aad096b286b2cd7d938
Change-Id: Idd3be2e20eb90dff7f794aad096b286b2cd7d938
2 files changed