New APIs for immersive audio

- AudioManager: query of platform support for
 the whole feature
- Spatializer: entry point for spatializer
 capabilities, system APIs for configuration
 and compatibility with devices
- AudioAttributes: additions for behavior of
 a track for virtualization

Bug: 91404931
Test: atest AudioAttributesTest SpatializerTest
Change-Id: Ia81ae07a0e66497b0731209907ca62a524c0a515