Merge "libaudiohal: implement supportsBluetoothVariableLatency for HIDL" into udc-d1-dev am: e6d09667c9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/23883971

Change-Id: I26baf3eefa01f92d5fd857db50ab1ffebee1fd92
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>