video: msm: Check for null in LCDC IRQ handler
video: msm: Commit MDP baselayer pipe on LCDC

* Commit a6ab3c0 introduced this for
  everything except for LCDC.
* We need to commit the pipe or pipes are not unstaged.
video: msm: Configure blend before DMA for LCDC panel too

* Needed to avoid display glitching in BLT mode