msm: cpr: Add separate Vmin, Vmax for nominal and turbo frequencies

To have maximum power savings it is important to have separate
Vmin and Vmax defined for the nominal and turbo frequency ranges.

Change-Id: I479d4166baa104a3567035421d337d4aa3f73d2b
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>