Merge "audio: rename virtualizer stage to spatializer" into sc-v2-dev am: 3e295742 am: 828ee90b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/15611199

Change-Id: I0a08bf94f12c21c0a81f10731004fab7c8ac188e