Locking screen after timeout to dream

Show keyguard after screen-off lock timeout regardless if there is a secure lock pattern or not
Test: atest KeyguardViewMediatorTest, manual device testing with and without pass lock
Fixes: b/271317643
Bug: 275694445

Change-Id: I977529aca13dd94f8458136c366279918c02a987
Merged-In: I977529aca13dd94f8458136c366279918c02a987