Merge "DownmixProcess: Add tests to validate the downmix process." into main am: ab269e2fc7

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2849236

Change-Id: I5e75d980c2e8bfcea9eea304f9f470c95d3a60d4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>