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

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

Change-Id: I629120865fbc3140771352f38b033ddb84bd9d3c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>