charger: modify usb unplugged shutdown time in power off charging

Previous value for this feature is 10 secs which is too long,
and now change it to 2 secs.

CRs-Fixed: 535857
Change-Id: If1d74a25e00f897833092262c49a9a07d18c0674
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