SystemUI: Battery Bar

Summary:
Squashed commit of the following:

  - SystemUI: Battery Bar

  - SystemUI: BatteryBar: add to sw600dp status bar

Test Plan: Fixup for AOSP mode and CFXConstants, then test and merge

Reviewers: Mustaavalkosta, randall.rushing, michyprima, Roach

Differential Revision: http://review.codefirex.com/D282

Change-Id: I4b905862012828d005c8cfc56427c5433a8c5dcc