Merge "Subscribe to AudioManager to listen to currently selected device" into...

Merge "Subscribe to AudioManager to listen to currently selected device" into udc-dev am: f3e6c5d0 am: 8087aa1c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21673842



Change-Id: I5e7cf88bc19b32eedec05b6dfe49f4de1aa104ea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>