Merge "Lock screen lwp: fix wallpaper dimming" into udc-dev am: d5b96755

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22162855



Change-Id: Ifa8d7dba9e738944aabe6e3a26bf6e36f33530d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>