Revert "OC/UV interface"

This reverts commit 8d43490a092bdb690f6bea7883c705c5836c7cb8.
Revert "Revert "msm: clock-krait-8974: User voltage control for msm-cpufreq device""

This reverts commit 382a728f661776f9e5f22a899c14277af57753ed.