Revert "Revert "Voltage Control: allow for lower minimums""

This reverts commit 9a83a81289c1a9de4a22fb92de169efac055ea27.
Revert "fix derp with last cherry-pick"

This reverts commit a3894f64b42b2c0fcc228ff5ff61b2eb60843bcb.
Revert "Voltage Control: allow for lower minimums"

This reverts commit 852251c14f0820441e56dacd2ea249a4297d958b.
Revert "Voltage Control: add sysfs interface"

This reverts commit 563919de4ad9aacc06cc02f55748b0c2c1334da2.
Revert "Voltage Control: initial voltage control for MSM S4-Pro SOC"

This reverts commit 5234cecc0785941a7481f6ee1c9e4396eba7a269.