OMAPDSS: add missing __init for dss_init_ports

dss_init_ports() is missing __init, so fix that.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dss.c

@@ -774,7 +774,7 @@ static int __init dss_init_features(struct platform_device *pdev)
 	return 0;
 }
 
-static int dss_init_ports(struct platform_device *pdev)
+static int __init dss_init_ports(struct platform_device *pdev)
 {
 	struct device_node *parent = pdev->dev.of_node;
 	struct device_node *port;