OMAP: DSS2: change manual update scaling setup

Currently the update area on manual update displays is automatically
enlargened to fully cover scaled overlays. This patch makes that
optional, allowing the panel driver to choose if it's used or not.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index 32297b4..d0881e9 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -2860,7 +2860,8 @@
 }
 
 int omap_dsi_prepare_update(struct omap_dss_device *dssdev,
-				    u16 *x, u16 *y, u16 *w, u16 *h)
+				    u16 *x, u16 *y, u16 *w, u16 *h,
+				    bool enlarge_update_area)
 {
 	u16 dw, dh;
 
@@ -2884,7 +2885,8 @@
 	dsi_perf_mark_setup();
 
 	if (dssdev->manager->caps & OMAP_DSS_OVL_MGR_CAP_DISPC) {
-		dss_setup_partial_planes(dssdev, x, y, w, h);
+		dss_setup_partial_planes(dssdev, x, y, w, h,
+				enlarge_update_area);
 		dispc_set_lcd_size(*w, *h);
 	}