Audio: add system usage to audio policy engine schemas am: acd4a677 am:...

Audio: add system usage to audio policy engine schemas am: acd4a677 am: 2b10decf am: 9f063339 am: 705fae3e

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



Change-Id: Ia7e17cf7c4334b12bd5f675f349c9a21ccfe7c3d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>