[automerger skipped] audio: Use 'join' instead of 'stop' for stream workers am: 7a31a0ac -s ours

am skip reason: Merged-In If13f7239423657b80091239ff67e7fe350957e2e with SHA-1 657284d4 is already in history

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3430787



Change-Id: I8479302c8aaea2db2f422aa55231423c99296898
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>