Merge "Get the enforcing users from the DevicePolicyEngine." into udc-dev am: 69badb5b7a am: 3a1b82ddc4 am: d120243fad am: ed3f6b92c2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23214183

Change-Id: Iae4fc81ff4b165297cdd387ce84baf635b1e0460
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>