Merge "EffectDownmix: Use full 22.2 matrix" into sc-v2-dev am: 9dc68b9974 am: 1f54ff2b8c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/15798806

Change-Id: Ic31db9312c2a64aa8367b5269bc9d67f514ba002