Audio: add system usage to audio policy engine schemas am: acd4a677 am: 2b10decf am: 9f063339

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



Change-Id: Ic3101aa00bd25d5000d6d44214d1c657c76cf5c9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>