Force reload listings for ControlsStartable

This makes sure that by the time ControlsStartable needs to know about
the services, they have been fetched at least once. The call to
ControlsListingController#forceReload should happen in the background
thread.

Fixes: 271289611
Test: atest ControlsListingControllerImplTest
Test: atest ControlsStartableTest
Test: manual, adb shell dumpsys activity services
Change-Id: Ia6228854dbbc426cc50ef0626efc29ee3ac7bf44