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.
msm: mdp: Remove mixer1 blt for external

BLT mode is not needed for external displays since
there is no extra downscaling needed for videos.
video: msm: Remove old post processing overlay integration

Remove old implementation of HSIC and QSEED smoothing/sharpening overlay
integration. Need to replace with new implementation that better integrates
the existing functions of the two APIs.

CRs-Fixed: 380750
Change-Id: Id3469fad16764ed88e74a8da75bb873f726ba366
Signed-off-by: Carl Vanderlip <carlv@codeaurora.org>
Signed-off-by: Pravin Tamkhane <pravint@codeaurora.org>

Conflicts:
	drivers/video/msm/Makefile

Conflicts:
	drivers/video/msm/mdp4_overlay.c