audio: Retain IBinder for instances with MinSchedulerPolicy am: df5feba141 am: 7a98fce7b2 am: e8e6a31e87

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2356911

Change-Id: I0e1cfa22dd67fd12d772126d1ceec9d2180991a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>