Revert "Revert "charger: Draw battery percentage over charger screen""

This reverts commit a224de244d018ed9fb807831ec45de1f3882264a.

Change-Id: Ia2a882b072c409ed79f951a4ebbcbb81816dc22f
Merge pull request #3 from CarbonDev/kk

Revert "Revert "charger: Draw battery percentage over charger screen""