Add HFP default implementation am: 91d7f8b916 am: 7331e690fb am: 2bad42081b

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

Change-Id: Ic4fb91bf52a30cce8b2af72497efde77cb32e27a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>