drm/omap: omap_display_timings: rename y_res to vactive

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

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/hdmi_wp.c b/drivers/gpu/drm/omapdrm/dss/hdmi_wp.c
index 17f0d7a..05462cf 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi_wp.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi_wp.c
@@ -198,7 +198,7 @@ void hdmi_wp_init_vid_fmt_timings(struct hdmi_video_format *video_fmt,
 	DSSDBG("Enter hdmi_wp_video_init_format\n");
 
 	video_fmt->packing_mode = HDMI_PACK_10b_RGB_YUV444;
-	video_fmt->y_res = param->timings.y_res;
+	video_fmt->y_res = param->timings.vactive;
 	video_fmt->x_res = param->timings.hactive;
 
 	timings->hbp = param->timings.hbp;