Audio: add system usage to audio policy engine schemas am: d2ab30cb am:...

Audio: add system usage to audio policy engine schemas am: d2ab30cb am: 2c17a95f am: 8f6b57b5 am: 0dc6c0ab am: b3fcc5cf

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2719503



Change-Id: Ic2ce4f17de35147fd24193ab1b54a690c0c05288
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>