Powers off display and locks device for Secure Lock Device

When secure lock device is enabled, powers off the display and locks the
device

Bug: 401645997
Bug: 398058587
Flag: android.security.secure_lockdown
Test: atest FrameworksServicesTests:SecureLockDeviceServiceTest
Change-Id: Idcbd1355985c4164ad1427f80ce0b87b63fbf3bf