Merge "Add default provider id to the UI-backend interface" into udc-dev am: 8feb89a0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22912990



Change-Id: Ia92984e5c3c43f01b27b8f250cce2f40b3e89efc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>