Merge "Revert "Delete bluetooth.h"" am: 0763f1b968 am: 2ef70764b0 am: 4068f4c3dc

Original change: https://android-review.googlesource.com/c/platform/hardware/libhardware/+/2594895

Change-Id: Iebc9c4541fdcb0b495bdccb5e7f2c5dbc0ee74c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>