Add HFP default implementation am: 91d7f8b9 am: 0ec3b5a6 am: 289194c3

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



Change-Id: I892cb082d8a6bf9d645e2e85e2f6b86ab8f0506e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>