Merge "Remove unused LOCK_SCREEN_SHOW_SILENT_NOTIFICATIONS usage" into tm-qpr-dev am: 68ec906eba am: 94bf9d70b0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20191012

Change-Id: Iaf16cf599175d197fc031d729d636759ec749a18
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>