Voltage Control: initial voltage control for MSM S4-Pro SOC

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

Conflicts:

	arch/arm/mach-msm/Kconfig

Conflicts:
	arch/arm/mach-msm/Kconfig
Voltage Control: add sysfs interface

Signed-off-by: faux123 <reioux@gmail.com>
mach: msm: lower minimum voltage to 700000
config. userspace voltage control