Merge "Access AudioPlaybackConfiguration players under mPlayerLock" into udc-qpr-dev am: d414349d4e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24233633

Change-Id: I9c19c6279383b4c12d1149006453c9d0eabb2eab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>