- Add a ProgressiveDisclosureMixin that contains all logic for collapse
preference list when it's too long
- Refactored PreferenceController's updateState to take a preference
instead of PreferenceScreen, because with progressive disclosure the
preference can either be in screen or the mixin. DashboardFragment is
responsible finding the preference before passing it to controller.
Bug: 32255863
Test: RunSettingsRoboTests
Change-Id: I6713abd61c954ce12732902e5b3ca4d4c0b1563e
