Hides screen attention when attention service is not avaliable.

If a wrong attention package is pushed to users devices, the screen
attention won't work. In this case, we should also hide the settings
as well.

Test: atest AdaptiveSleepPreferenceControllerTest
Bug: 148099790
Change-Id: Ieb4fd1008856024c23624f0eab3dfbfc3fc4ee3b