Merge "Hide taskbar on lockscreen" into sc-v2-dev am: 61eb1fe0ac am: bb8e304ee6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15264051

Change-Id: I667a07fc780f01908e5646f09fe3b8c5c43910ef