Audio: add system usage to audio policy engine schemas am: acd4a677f0 am: 2b10decfc0 am: 9f063339aa am: 705fae3e93 am: 97201373eb

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2689186

Change-Id: Id41d3cb8295e2fb4d3871efeb64674458ac1fbf9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>