ARM/video: omap2: Move omap_display_init declaration to mach-omap2/display.h

The omap_display_init() is implemented in the mach-omap2/display.c so the
declaration should have been there as well.
Change the board files to include display.h to avoid build breakage at the
same time.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-ldp.c

@@ -47,6 +47,7 @@
 #include "hsmmc.h"
 #include "control.h"
 #include "common-board-devices.h"
+#include "display.h"
 
 #define LDP_SMSC911X_CS		1
 #define LDP_SMSC911X_GPIO	152

arch/arm/mach-omap2/board-rx51-video.c

@@ -22,6 +22,7 @@
 
 #include "soc.h"
 #include "board-rx51.h"
+#include "display.h"
 
 #include "mux.h"
 

arch/arm/mach-omap2/display.h

@@ -33,4 +33,9 @@ int omap_init_vout(void);
 
 struct device_node * __init omapdss_find_dss_of_node(void);
 
+struct omap_dss_board_info;
+
+/* Init with the board info */
+int omap_display_init(struct omap_dss_board_info *board_data);
+
 #endif

include/video/omapdss.h

@@ -330,9 +330,6 @@ struct omap_dss_board_info {
 	enum omapdss_version version;
 };
 
-/* Init with the board info */
-extern int omap_display_init(struct omap_dss_board_info *board_data);
-
 struct omap_video_timings {
 	/* Unit: pixels */
 	u16 x_res;