Merge "Updates the HEADSETHOOK system action to directly answer/hangup calls." into udc-dev am: 6b19f3fa am: d8ecf942 am: 68a620c0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22725792



Change-Id: I504e267729333a331b8f5fd04d92af2a4965b41f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>