Merge "Add the connection state change handle for the volume control profile" into udc-dev am: 2a37e27c am: 54d59b8c am: d46d9d47

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23276876



Change-Id: I75286ebbefcb9cd9c3308616038f88ab7415444c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>