Window Manager Flag Migration (5/n)

Completely remove the system UI visibility from the SystemUI side.

Bug: 118118435
Test: atest InsetsSourceProviderTest InsetsStateControllerTest
            InsetsPolicyTest WindowStateTests CommandQueueTest
            RegisterStatusBarResultTest InsetsFlagsTest
            LightBarControllerTest RegisterStatusBarResultTest
Test: build on specific target
Change-Id: Ibc866c5fbb35582dad8fd1a90376ce47dc501377