RESTRICT AUTOMERGE Center align the lock screen wallpaper am: c9e25a5d am: b3e1d7b1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24104093



Change-Id: Ia73e8a29bfd5706c9317a9867839fc0a0e2d31de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>