Merge "libaudiohal@aidl: Properly handle "legacy" r_submix case" into main am:...

Merge "libaudiohal@aidl: Properly handle "legacy" r_submix case" into main am: 636a5b50 am: 365e161d am: 69ae08bb

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2825373



Change-Id: Ie8df7e1f72f12c13a71532819dfb0d42941e8b84
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>