Add HFP default implementation am: 91d7f8b916 am: 0ec3b5a607

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

Change-Id: I21ced679b1fb96666ca10fe9bdf199ed7754ed3d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>