audio: Use hardcoded r_submix configuration with XML am: fc35ca3d32 am: 067d106779

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2794109

Change-Id: Iac161dbadeef7b41502443a26b00fc1f58cb91c9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>