Merge "Remove the usage of device_config flag: DisplayManagerService.KEY_ALLOW_ALWAYS_UNLOCKED_VIRTUAL_DISPLAYS." into tm-dev am: 0927574f am: e02e8396 am: cb7bfe86 am: 12e67322

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



Change-Id: Ib5b52f95e2f6b084fbdb3e9fd9aea8cc4154b4af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>