drm/msm/sde: add support to handle reduction in dma linewidth

Add support to handle those targets where dma
pipe width is less compared to vig pipewidth.

Change-Id: I70dbd44b4883f49879686003ba1fe9694434daab
Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>