Merge "audio: only allow AudioMix with same format on direct output." into main am: f1c219d371 am: eff10c0b70

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2975331

Change-Id: I8671aad2e709fae869dffd2e01f461569005a065
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>