video: Move video_get_info_str() prototype to a header file

This should be defined in a header file so that arguments are checked.
Move it to video.h.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

board/liebherr/lwmon5/lwmon5.c

@@ -13,6 +13,7 @@
 #include <asm/io.h>
 #include <post.h>
 #include <flash.h>
+#include <video.h>
 #include <mtd/cfi_flash.h>
 
 DECLARE_GLOBAL_DATA_PTR;

board/mosaixtech/icon/icon.c

@@ -11,6 +11,7 @@
 #include <libfdt.h>
 #include <fdt_support.h>
 #include <netdev.h>
+#include <video.h>
 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/ppc4xx-gpio.h>

board/mpl/common/common_util.c

@@ -15,6 +15,7 @@
 #include <pci.h>
 #include <malloc.h>
 #include <bzlib.h>
+#include <video.h>
 
 #ifdef CONFIG_PIP405
 #include "../pip405/pip405.h"

board/tqc/tqm5200/tqm5200.c

@@ -18,6 +18,7 @@
 #include <asm/processor.h>
 #include <libfdt.h>
 #include <netdev.h>
+#include <video.h>
 
 #ifdef CONFIG_VIDEO_SM501
 #include <sm501.h>