Voltage Control: initial voltage control for MSM Snapdragon 800 SOC

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

Signed-off-by: faux123 <reioux@gmail.com>
Signed-off-by: aatjitra <aatjitra@gmail.com>