audio: mixer_paths: Rename mixer paths from hdmi to default audio out am: ab067abe63

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/3177719

Change-Id: Ie8a435bdf9faf12a15a10d32be424b6af3d44765
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>