audio policy service: fix spatializer locking scheme am: 441b487e am: 6b33f88e am: 2d240caf

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2208195



Change-Id: Ic6eae6565f53c07b01fad264918e580d23ef6683
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>