acpuclock-8x60: Add voltage control

Taken from: https://github.com/sultanxda/sultan-kernel-skyrocket-pure/commit/d1fd22ecccfce9414ddfbc31803789d07f1fbf38
acpuclock-8x60: Add overclocking

Taken from: https://github.com/sultanxda/sultan-kernel-skyrocket-pure/commit/666badbcb5a6d67e31fd32c21485cb270ff2ba20#diff-e53d05dcb8c7e725135c6a30c0173d58R7880