mdp: Do not start LUT for overlay0

The post processing daemon is not used currently.
Enabling the LUT without using it can potentially
cause display hangs.
video: msm: Increase MDP clock multiplier

 * 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. Underrun was occurring when FLIP_LR was set on any pipe,
   which is the case for 180 rotation (FLIP_LR|FLIP_UD).
 * Raise the multiplier from 1.15 to 2 to fix the underrun.

Change-Id: Iadd7facde88520a90a4394f57fe28214a92741a3
video: msm: Fix blending on MDP4.1 DSI video targets

Change-Id: I5aad16f7a2f2159b46916b14345a09d73b30a570