drm/vc4: Use drm_hdmi_avi_infoframe_bars()

Use the new drm_hdmi_avi_infoframe_bars() helper instead
of hand rolling it.

Cc: Eric Anholt <eric@anholt.net>
Cc: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191008164814.5894-2-ville.syrjala@linux.intel.comReviewed-by: Boris Brezillon <boris.brezillon@collabora.com>

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -398,10 +398,7 @@ static void vc4_hdmi_set_avi_infoframe(struct drm_encoder *encoder)
 					   HDMI_QUANTIZATION_RANGE_LIMITED :
 					   HDMI_QUANTIZATION_RANGE_FULL);
 
-	frame.avi.right_bar = cstate->tv.margins.right;
-	frame.avi.left_bar = cstate->tv.margins.left;
-	frame.avi.top_bar = cstate->tv.margins.top;
-	frame.avi.bottom_bar = cstate->tv.margins.bottom;
+	drm_hdmi_avi_infoframe_bars(&frame.avi, cstate);
 
 	vc4_hdmi_write_infoframe(encoder, &frame);
 }