Merge "audio: Allow specifying "default" stream type in V7" am: 9dac2b95fc

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1582322

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I911d2b7f5b607de9576c02fd9ff4c100b0e01d1a