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/displays/connector-analog-tv.c b/drivers/gpu/drm/omapdrm/displays/connector-analog-tv.c
index 51d0d45..d14cc2e 100644
--- a/drivers/gpu/drm/omapdrm/displays/connector-analog-tv.c
+++ b/drivers/gpu/drm/omapdrm/displays/connector-analog-tv.c
@@ -38,7 +38,7 @@ static const struct omap_video_timings tvc_pal_timings = {
 	.hback_porch	= 68,
 	.vsync_len	= 5,
 	.vfront_porch	= 5,
-	.vbp		= 41,
+	.vback_porch	= 41,
 
 	.interlace	= true,
 };