drm/omap: omap_display_timings: rename hbp to hback_porch

In preparation to move the stack to use the generic videmode struct for
display timing information rename the hbp member to hback_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-hdmi.c b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
index fd1178b..24d0478 100644
--- a/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
+++ b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
@@ -27,7 +27,7 @@ static const struct omap_video_timings hdmic_default_timings = {
 	.pixelclock	= 25175000,
 	.hsync_len	= 96,
 	.hfront_porch	= 16,
-	.hbp		= 48,
+	.hback_porch	= 48,
 	.vsw		= 2,
 	.vfp		= 11,
 	.vbp		= 31,