msm: kgsl: Dynamically create an OPP table at runtime

The other reason why we define a OPP table for each target is for devfreq.
This is equally as silly as the first reason because we already have a
frequency table and forcing the developer to define it twice only invites
a mistake.  Remove the need for the static OPP table and create it
dynamically, at run time, from the information we already have.

Change-Id: Ic0dedbada16ec0832c0d531f39460f14aadc1bdd
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>