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

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



Change-Id: I0ef8bc93cb3be9df24842e00c8be4a9375b09d9a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>