Revert "Remove unused hardware/bluetooth.h include"

Revert submission 2517798-remove_bluetooth_h

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_tm-qpr-dev-plus-aosp&target=aosp_bramble-userdebug&lkgb=10164200&lkbb=10164726&fkbb=10164208

Reverted changes: /q/submissionid:2517798-remove_bluetooth_h

Bug: 10164208
Change-Id: I52877f236db874e95228707d533698e3c12ecde1