Revert "Voltage Control: add sysfs interface"

This reverts commit 3312f1e951eedfb4ebc899d1c341ac705d6895d3.
Revert "Voltage Control: initial voltage control for MSM S4-Pro SOC"

This reverts commit d588463bdadb6462fc8c2b0d29986ea7f59137a8.
Revert "Overclocking: limit initial max to system default"

This reverts commit 2c379336e13865aa78f0e133a1abba607da38cbf.