Merge "Revert "libeffects: Fix processed samples for downmix effect"" into...

Merge "Revert "libeffects: Fix processed samples for downmix effect"" into main am: 24c5a9f4 am: 030e409c

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2901161



Change-Id: I9ed7e7edbc4b2a563890cc421152105cc1eaf07b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>