Merge "Spatializer: document state getters when feature is unsupported" into...

Merge "Spatializer: document state getters when feature is unsupported" into sc-v2-dev am: 2f645f23 am: 4fd2aa3c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16040116

Change-Id: I0b9ef86b5065eea565e735271f62e26fb0c4014d