Merge "AudioDeviceInventory: fix devices role cache purge." into udc-dev am: 10639c55 am: 212310f4 am: f2c1c297

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23492176



Change-Id: If6dd29ff1fc9d0246a8bcbd7aba7d347762a691e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>