Refactor badging notification preference controller.

- Convert inheritance from AbstractPreferenceController to TogglePreferenceController.
- Register BadgingNotificationPreferenceController in XML.
- Add RoboTests test cases for BadgingNotificationPreferenceController.

Fixes: 67997784
Test: RunSettingsRoboTests
Change-Id: If10744c067f065e7c2465ca1fff66895d7dc1c56
Merged-In: If10744c067f065e7c2465ca1fff66895d7dc1c56