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

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

Change-Id: I395ea24ffbc9959ecfa02735716f10a181fdb441
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>