Revert "Voltage Control: add sysfs interface"

This reverts commit d5ac582f3b65361554bb5e6f1659d4494111674c.
Revert "Voltage Control: initial voltage control for MSM S4-Pro SOC"

This reverts commit f995bc5c748fcbb3e636a701a0337849b9ea32da.
jf: acpuclock/cpufreq: custom voltage control

* CONFIG this later

Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>