Merge "[Media ML] Let MCS manage MediaSession2" into sc-dev am: b8407d691c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13530454

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1f4aa6f73d8f747d9aede687b4de1dffa0b52836