video: Add function to obtain the U-Boot logo

It is useful to show the logo from other code, coming in a later feature.
Add a function to obtain it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/video.h b/include/video.h
index 4c216d8..2e68dd7 100644
--- a/include/video.h
+++ b/include/video.h
@@ -319,4 +319,11 @@
  */
 bool video_is_active(void);
 
+/**
+ * video_get_u_boot_logo() - Get a pointer to the U-Boot logo
+ *
+ * Returns: Pointer to logo
+ */
+void *video_get_u_boot_logo(void);
+
 #endif