msm: clock-krait-8974: User voltage control for msm-cpufreq device

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

Change-Id: I2b193c849e2898a9f84a09ae7479e9aa9e399d8f
Defconfig: enable voltage control

Change-Id: I2700c5858538d34ad84d79f53d88855c8b513e20