audio: Add AUDIO_FORMAT_DEFAULT to supported formats (V6) am: 50bf1116fc am: 12b2c93b10 am: bd701ebc51 am: ee5066c40d

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2989191

Change-Id: Id9d1f231d050e7bd1d01b08b7e8874d6e4464fce
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>