Added Voltage interface for GPU - Thanks KT

Conflicts:
	drivers/cpufreq/cpufreq.c
msm: kgsl: added limits to gpu voltages userspace
msm: kgsl: rework naming convention for gpu undervolt userspace
msm: kgsl: disable debug for gpu undervolt userspace
msm: kgsl: remove unused for gpu undervolt userspace
Kernel Version: AK.201.EXODUS.MAKO