[DO NOT MERGE] Add setting custom MediaButtonReceiver am: 7d8d596370 am: 44c4243264 am: b38252864f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11629766

Change-Id: I52c15bfeeddb3b4838af7e4f4db1bed2e55bdea2