video: msm: Increase MDP clock multiplier

  Quoted from original commit:
"* The porch values used on Samsung's panel drivers are very tight, and
   cause the MDP clock rate calculation to be right on the edge of
   stability...Raise the multiplier from 1.15 to 2 to fix the underrun."

   Believe we are experience the same thing or remotely similar to this on 3.4 base.

Change-Id: Iadd7facde88520a90a4394f57fe28214a92741a3