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/omap_connector.c b/drivers/gpu/drm/omapdrm/omap_connector.c
index 3798617..d6c4dc1 100644
--- a/drivers/gpu/drm/omapdrm/omap_connector.c
+++ b/drivers/gpu/drm/omapdrm/omap_connector.c
@@ -55,7 +55,7 @@ void copy_timings_omap_to_drm(struct drm_display_mode *mode,
 	mode->vdisplay = timings->vactive;
 	mode->vsync_start = mode->vdisplay + timings->vfront_porch;
 	mode->vsync_end = mode->vsync_start + timings->vsync_len;
-	mode->vtotal = mode->vsync_end + timings->vbp;
+	mode->vtotal = mode->vsync_end + timings->vback_porch;
 
 	mode->flags = 0;
 
@@ -89,7 +89,7 @@ void copy_timings_drm_to_omap(struct omap_video_timings *timings,
 	timings->vactive = mode->vdisplay;
 	timings->vfront_porch = mode->vsync_start - mode->vdisplay;
 	timings->vsync_len = mode->vsync_end - mode->vsync_start;
-	timings->vbp = mode->vtotal - mode->vsync_end;
+	timings->vback_porch = mode->vtotal - mode->vsync_end;
 
 	timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 	timings->double_pixel = !!(mode->flags & DRM_MODE_FLAG_DBLCLK);