Add HFP default implementation am: 91d7f8b916

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2806339

Change-Id: I011c70461c36c910e0fc22ce61946259f0a16b0f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>