Voltage Control: generic voltage control for DTS based kernels

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

Conflicts:
	arch/arm/mach-msm/Kconfig
	arch/arm/mach-msm/clock-krait-8974.c
	arch/arm/mach-msm/cpufreq.c
	drivers/cpufreq/cpufreq.c
PM / devfreq: Fix simple_ondemand crashing