audio policy: Fix removing device role when disconnected am: 78fedbf1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/21911727



Change-Id: I68b8bcf548baf2a35453e320bb44cbd6f4aef3a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>