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

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

Change-Id: I0b5d5b5bab41e0f8264fe8b10f014a6588cb045e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>