Voltage Control: generic voltage control for DTS based kernels

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

Conflicts:
	arch/arm/mach-msm/clock-krait-8974.c
	drivers/cpufreq/cpufreq.c

Conflicts:
	arch/arm/mach-msm/Kconfig
msm-sleeper: limit max freq when screen is off
msm-sleeper: limit max freq when screen is off (part 2)

Conflicts:

	arch/arm/mach-msm/Kconfig
msm-sleeper: disable messages