Revert "Voltage Control: allow for lower minimums"

This reverts commit 191326ff7a9d1e318909e32ab37569446b31c756.
Revert "Voltage Control: add sysfs interface"

This reverts commit fac6eae2c9d3dd4d44c1879e8ba1e3919d53cc11.
Revert "Voltage Control: initial voltage control for MSM Snapdragon 800 SOC"

This reverts commit fe1b019f094e8f74cec16defd64f6d01a975919d.
hammerhead: Remove Voltage control