Merge "le_audio: Introduce connection state handling for LE Audio group" into stage-aosp-master am: 2f0430af32 am: 22c3b6feeb am: a87eaff74e am: 293bf0e143

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15736950

Change-Id: Id16149852bb828ac5e00f8a6a31b91bf503153de