charger: press power key to turn off charging animation

When charging animation is on, press power key to turn it off.

CRs-Fixed: 535893
Change-Id: Iaac536351426a09cb23c6d77ff3229a8901aaf70
charger: Fix arguments to gr_text

 * CWM's minui is oldschool, so comment this out for now.

Change-Id: If88d2df820b164fbb02ce6c40cba42de7880e86a
charger: Update to match AOSP recovery API

Change-Id: I2f8e0213e438c352dc5954faa287374e33985d65