Merge "Adds way to hide the clock in lock screen preview." into tm-qpr-dev am: 7c1e07e54c am: 84c9861d01

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21353673

Change-Id: I2b85aaf4d89f9c1985eeea96545b41517038ec21
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>