Lights out improvements.

+ Finally implemented LO in the top status bar.
+ Tightened up LO animations on nav bar (swap icons for dots
  all at once rather than in sequence).

Bug: 6374406 (status bar lights out)
Bug: 5854958 (tighten up)
Change-Id: Id1393cef0b4281e062c1704d916843641da19dc4