Merge changes I4de707b0,I32f5d135,I78609a4e into msm-3.0

* changes:
  msm: rpm-regulator: Add support for MSM8930 voltage corner regulator
  msm: rpm-regulator: Add support for new voltage corner RPM regulator type
  msm: rpm-8930: Update RPM enum to support RB-CPR corner voltage