Add BLX driver

* Battery Life eXtender kernel module for msm8974.
* Read more: http://forum.xda-developers.com/nexus-s/development/mod-battery-life-extender-blx-t1257497

Signed-off-by: Cl3Kener <Cl3Kener@gmail.com>
Signed-off-by: LaboDJ <jacopolabardi@gmail.com>

Conflicts:
	drivers/misc/Makefile

Conflicts:
	drivers/misc/Makefile

Conflicts:
	drivers/misc/Makefile

(cherry picked from commit e3185ec971c2254e2cee6a13aa04ddca2764f87a)
defconfig: enable BLX driver
	modified:   arch/arm/configs/purified_defconfig