audio: mixer_paths: Rename mixer paths from hdmi to default audio out am: ab067abe63 am: 61b3f22d7c

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

Change-Id: I0485ff1fa9f6312e01afc11dd924e8fd9287f557
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>