Change preference keys of duplicate settings between
display and battery to avoid duplication in search.
Bug: 33701673
Test: make RunSettingsRoboTests
Change-Id: I56c82e9e7f163d345065ca478849de9b14c173fe
The items been added to group are: Adaptive brightness, Sleep.
Battery saver has been moved into this group as well.
Also refactor the code a little bit to make it fit the
preferenceController. Whole refactor of PowerUsageSummary and
PowerUsageDetail will be tracked in b/34386721
Bug: 34279051
Test: runSettingsRoboTests & Screenshot
Change-Id: I702d8479d1b80f7e9cf1a46752c75bf5d189e0f6