PORT: Battery Life eXtender (BLX)

This is a simple port of Ezekeel's BLX mod to the G2.

BLX: Set default limit to 98

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.