msm_fb: display: enable hw cursor for dsi video panel

fix hw cursor updates not coming for dsi video panel defining callback
during driver setup.

CRs-Fixed: 309515
Change-Id: I12586e813c19ff4dbe1e3877eaf14b5a396b273a
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>
diff --git a/drivers/video/msm/mdp.c b/drivers/video/msm/mdp.c
index 936b5d4..ca3c079 100644
--- a/drivers/video/msm/mdp.c
+++ b/drivers/video/msm/mdp.c
@@ -1442,6 +1442,10 @@
 		}
 
 #endif
+		if (mdp_rev >= MDP_REV_40)
+			mfd->cursor_update = mdp_hw_cursor_sync_update;
+		else
+			mfd->cursor_update = mdp_hw_cursor_update;
 		break;
 
 	case MIPI_CMD_PANEL: