Voltage Control: add sysfs interface

Signed-off-by: faux123 <reioux@gmail.com>

Voltage Control: allow for lower minimums

this allows the low CPU frequencies to take advantage of UV control

Signed-off-by: faux123 <reioux@gmail.com>

Conflicts:

	arch/arm/mach-msm/board-m7-regulator.c

Voltage Control: initial voltage control for MSM Snapdragon 800 SOC

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