drm/omap: move display, dss-of, output to omapdss-base

This patch moves the common parts of omapdss to omapdss-base so that
both the current omapdss driver and the new omapdss6 driver can use
them.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/dss/dss-of.c b/drivers/gpu/drm/omapdrm/dss/dss-of.c
index dfd4e96..b46606b 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss-of.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss-of.c
@@ -19,7 +19,6 @@
 #include <linux/seq_file.h>
 
 #include "omapdss.h"
-#include "dss.h"
 
 struct device_node *
 omapdss_of_get_next_port(const struct device_node *parent,
@@ -110,6 +109,7 @@ struct device_node *dss_of_port_get_parent_device(struct device_node *port)
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(dss_of_port_get_parent_device);
 
 u32 dss_of_port_get_port_number(struct device_node *port)
 {
@@ -122,6 +122,7 @@ u32 dss_of_port_get_port_number(struct device_node *port)
 
 	return reg;
 }
+EXPORT_SYMBOL_GPL(dss_of_port_get_port_number);
 
 static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
 {