drm/omap: omap_display_timings: rename vbp to vback_porch

In preparation to move the stack to use the generic videmode struct for
display timing information rename the vbp member to vback_porch.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/dss/rfbi.c b/drivers/gpu/drm/omapdrm/dss/rfbi.c
index de7f904..cc59e64 100644
--- a/drivers/gpu/drm/omapdrm/dss/rfbi.c
+++ b/drivers/gpu/drm/omapdrm/dss/rfbi.c
@@ -863,7 +863,7 @@ static void rfbi_config_lcd_manager(struct omap_dss_device *dssdev)
 	rfbi.timings.hback_porch = 1;
 	rfbi.timings.vsync_len = 1;
 	rfbi.timings.vfront_porch = 0;
-	rfbi.timings.vbp = 0;
+	rfbi.timings.vback_porch = 0;
 
 	rfbi.timings.interlace = false;
 	rfbi.timings.hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;