Move listener to lockscreen setting to application scope

There is a binder call in the code checking lockscreen setting.
Executing this code everytime screen transitions go to lockscreen is
expensive. It is better to execute the binder call one time in the
application scope.

Flag: EXEMPT BUGFIX
Bug: 331800609
Bug: 330801389
Test: atest MediaCarouselControllerTest

Change-Id: Ia165e7fd63690403bfa6b61890d63b632c031d5e