event: Pass the images to EVT_FT_FIXUP

Pass the boot images along as well, in case the fixups need to look at
them.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/event.h

@@ -60,9 +60,11 @@ union event_data {
 	 * struct event_ft_fixup - FDT fixup before booting
 	 *
 	 * @tree: tree to update
+	 * @images: images which are being booted
 	 */
 	struct event_ft_fixup {
 		oftree tree;
+		struct bootm_headers *images;
 	} ft_fixup;
 };