Merge "Set bluetooth.audio AIDL HAL to mandatory for Android T" am: 53b601d590 am: c6e816aad8 am: 31a9f2280c am: b3a4a1b11e

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1977705

Change-Id: Ie0f41413abe4c21cf2cef2ffe592170f1312c474