[automerger skipped] AudioTrack: Enforce worker thread join in dtor am: b510fcd807 -s ours am: 152cad58ed -s ours

am skip reason: Merged-In I144710cb9865d45508d2f97402f748dad7e63a07 with SHA-1 1f95051c77 is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3166084

Change-Id: I6d51772d5b565f81f653e6ca8f08f061032f98a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>