Merge "Add a new config to support primary credential providers. Also renamed...

Merge "Add a new config to support primary credential providers. Also renamed the existing defaultCredentialProvider to enabledCredentialProvider to reduce the confusiton." into udc-dev am: 02e6c5d7 am: 6d9d7ded

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22977989



Change-Id: I753bafcaad991701b1a158d38e628c42264514bf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>