audio: Implement blocking in remote submix when there is no sink am: a41ff513

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3009658



Change-Id: Ie71efa7ec303bb311b546e28db3d71b428c46c76
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>