Merge "Remote Submix Out is not a permanently attached device, and thus...

Merge "Remote Submix Out is not a permanently attached device, and thus requires a non-empty string for its connection." am: c3c62a1e am: 6ece4d97 am: 33ba6894

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2393575



Change-Id: I3e335b32a96a646f02c575453c703ded21adaaa2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>