Merge "Remove the usage of device_config flag:...

Merge "Remove the usage of device_config flag: DisplayManagerService.KEY_ALLOW_ALWAYS_UNLOCKED_VIRTUAL_DISPLAYS." into tm-dev am: 0927574f am: 2af89948 am: 8d776e8d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17943723



Change-Id: I39d6c51fdf958763fada9bb5070556133dadb5ba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>