mdss: display: add support of dual dsi partial update.

This patch adds l_roi and r_roi fields to display commit struct to
support partial update for dual DSI panels. Panel side
frame buffer's column, page address and DSI controller's
stream size are updated based on the ROI requested.

Change-Id: I70957c9ee1546448416441a8d0608fb00c3b92ca
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>