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

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



Change-Id: I7a102c9c3fb367b66f9a7772f99c3934554bcadf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>