audio: Allow stopping a StreamWorker from the looping thread am: 48d3115614 am: 33b5a6d8b4 am: 8883713e20

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2199344

Change-Id: I6367520a55e69da3f866d657d115b04d9e86b0f6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>