blx: Battery Life eXtender (BLX)

This is a simple port of Ezekeel's BLX mod to the Nexus 4.

See this thread for more information: http://forum.xda-developers.com/showthread.php?t=1257497

Let's keep the same sysfs implementation so that apps, such as Trickster MOD, can support this.
blx: Change the max charge to 100
cyanogen_mako_defconfig: enable BLX

Signed-off-by: Kristofer Ard <kristoferard@gmail.com>

Conflicts:
	arch/arm/configs/cowboy_defconfig