mdp4: Port mddi overlay from CAF kk_2.7_rb1.35

I tried porting all of the framebuffer drivers at once, and it didn't boot, so I'm doing it in phases.

Signed-off-by: Sultanxda <sultanxda@gmail.com>

Conflicts:
	drivers/video/msm/mdp4_overlay.c
msm_fb: Sync all iommu references with CAF msm-kk_2.7_rb1.38

Graphical glitches should be gone now.

Signed-off-by: Sultanxda <sultanxda@gmail.com>

Conflicts:
	drivers/video/msm/mdp4_overlay.c