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

This will allow uv and oc on current frequencies. -25mv by step. Stop when your device can't handle it.

Signed-off-by: Jean Francis Dominique S. Mabalot <jfdsmabalot@redhat.com>

Conflicts:
	arch/arm/mach-msm/Kconfig
Merge upstream changes

Signed-off-by: Jean Francis Dominique S. Mabalot <jfdsmabalot@redhat.com>