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: e52a44c4 am: 2334aef7

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



Change-Id: I74db02d5e1a04a4c8942a36efa4ccbca24244488
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>