Spatial audio: add property for spatializer effect

Ignore-AOSP-First: confidential feature

Add a property to be read by system_server's AudioService that
indicates whether a spatializer effect is available on the device.
If true, spatialization functionality will be initialized.

Bug: 188502620
Test: adb shell dumpsys audio | grep -A 4 Spatial
Change-Id: I759e2fb32087b6e8e2a578b6ec804fb7c4f1d4f1
1 file changed