audio policy service: fix spatializer locking scheme

The audio policy service should never call Spatializer controller
methods with its mutex held. This rule was only partly repected.
This CL fixes the remaining call sites.

Bug: 237833275
Test: repro steps in the bug.
Change-Id: I2a1828d9e4cd3e16a68c727ae84329c92666c6ab
2 files changed