RESTRICT AUTOMERGE Center align the lock screen wallpaper am: c9e25a5d5f am: 2c51ffb122 am: 8d4e7404fc

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

Change-Id: I03a7f547967fe22b3d4c0200f1afb7bdfb354770
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>