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/dss/venc.c b/drivers/gpu/drm/omapdrm/dss/venc.c
index 92dbcab..f192368 100644
--- a/drivers/gpu/drm/omapdrm/dss/venc.c
+++ b/drivers/gpu/drm/omapdrm/dss/venc.c
@@ -268,7 +268,7 @@ const struct omap_video_timings omap_dss_pal_timings = {
 	.pixelclock	= 13500000,
 	.hsync_len	= 64,
 	.hfront_porch	= 12,
-	.hbp		= 68,
+	.hback_porch	= 68,
 	.vsw		= 5,
 	.vfp		= 5,
 	.vbp		= 41,
@@ -289,7 +289,7 @@ const struct omap_video_timings omap_dss_ntsc_timings = {
 	.pixelclock	= 13500000,
 	.hsync_len	= 64,
 	.hfront_porch	= 16,
-	.hbp		= 58,
+	.hback_porch	= 58,
 	.vsw		= 6,
 	.vfp		= 6,
 	.vbp		= 31,