Voltage Control: initial voltage control for MSM Snapdragon 800 SOC

Signed-off-by: Paul Reioux <reioux@gmail.com>
Voltage Control: add sysfs interface

Signed-off-by: faux123 <reioux@gmail.com>
Defconfig: add Faux Voltage Control

Change-Id: I9d5e40181c371f467e4a9085cd52940f73ea47e8