Merge "SonivoxTest: Use MediaPreparer to download test files" into main am: 5e9ae01ee1

Original change: https://android-review.googlesource.com/c/platform/external/sonivox/+/2773024

Change-Id: I907eaad6952bf83043be60d76bcf76459e7a4e3e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>