Merge "audioflinger: Move async callback setting to onFirstRef" am: 0852c962...

Merge "audioflinger: Move async callback setting to onFirstRef" am: 0852c962 am: e6cda358 am: e04f6a9d am: 0e5a56f6

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2452165



Change-Id: I582ee910943a8d8c72486e45e17bfb6c68a93a05
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>