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: If4474fc73bc648f69068d9dfc98b30db39711ada
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>