blx: Battery Life eXtender (BLX)

This is a simple port of Ezekeel's BLX mod to the LGE v500.

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.

Ported from https://github.com/anarkia1976/AK-xGenesis/commit/32bb132f334188279f533040ec0d416d5124c84f

Signed-off-by: oubeichen <oubeichen@gmail.com>