Merge "AudioDeviceInventory: fix purge of device role cache." into udc-dev am: cd5243dc am: a6b0a33b am: d0f31157 am: 068f4a56

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23712844



Change-Id: Icf284fb01ff0329d01265bd9452c3aa9f6aa76f5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>