msm8960-common: add chargeled program

A small program to update the LED indicator based on charging status.
Can be used as a service in recovery, for instance.
* Green LED for charged
* Amber LED for charging
* LED off all other cases

Change-Id: I063013e312f5783f135732f63f8b4e1ba3695915
Merge remote-tracking branch 'cm/cm-11.0' into HEAD