[ARM] omap: fix a load of "warning: symbol 'xxx' was not declared. Should it be static?"

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/video/omap/dispc.h b/drivers/video/omap/dispc.h
index eb1512b..ef720a7 100644
--- a/drivers/video/omap/dispc.h
+++ b/drivers/video/omap/dispc.h
@@ -40,4 +40,6 @@
 extern int  omap_dispc_request_irq(void (*callback)(void *data), void *data);
 extern void omap_dispc_free_irq(void);
 
+extern const struct lcd_ctrl omap2_int_ctrl;
+
 #endif