clk: msm: clock: Populate clock OPP tables during clk_register

Add support to populate the OPP tables for clocks. This is done in the
call to register clock tables with clkdev. To add an OPP table for a
clock, add the phandle reference to the device driver as
qcom,"clock-name"-opp-handle. Alternately, if the voltage values stored
in the OPP table are the actual corners, add the phandle reference to
the device driver as "qcom,"clock-name"-opp-store-vcorner".

Change-Id: I097a6cad1ef294995bc6c7247044f54e42b36ae4
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>