drm/omap: omap_display_timings: rename hfp to hfront_porch

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

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/rfbi.c

@@ -859,7 +859,7 @@ static void rfbi_config_lcd_manager(struct omap_dss_device *dssdev)
 	 * omapdss_rfbi_set_size()
 	 */
 	rfbi.timings.hsync_len = 1;
-	rfbi.timings.hfp = 1;
+	rfbi.timings.hfront_porch = 1;
 	rfbi.timings.hbp = 1;
 	rfbi.timings.vsw = 1;
 	rfbi.timings.vfp = 0;