disp: msm: sde: add line insertion support for sspp

Add line insertion support for sspp, this is used to support
display with external splitter. Line insertion logic checks
the difference between screen logical height and physical
height. If any difference is observed adds dummy and active
lines on screen.

Change-Id: Ieec322273df000a53fb39e05174c2d67c3c2da81
Signed-off-by: Rajesh kv <quic_kvrajesh@quicinc.com>

msm/msm_drv.h

@@ -800,6 +800,7 @@ struct msm_display_wd_jitter_config {
  * @dyn_clk_list: List of dynamic clock rates for RFI.
  * @qsync_min_fps: qsync min fps rate
  * @wd_jitter:         Info for WD jitter.
+ * @vpadding:        panel stacking height
  */
 struct msm_mode_info {
 	uint32_t frame_rate;
@@ -822,6 +823,7 @@ struct msm_mode_info {
 	struct msm_dyn_clk_list dyn_clk_list;
 	u32 qsync_min_fps;
 	struct msm_display_wd_jitter_config wd_jitter;
+	u32 vpadding;
 };
 
 /**