u-boot: Update yaffs2 file system

This patch updates the yaffs2 in u-boot to correspond to
git://www.aleph1.co.uk/yaffs2
commit id 9ee5d0643e559568dbe62215f76e0a7bd5a63d93

Signed-off-by: Charles Manning <cdhmanning@gmail.com>
diff --git a/fs/yaffs2/stdlib.h b/fs/yaffs2/stdlib.h
new file mode 100644
index 0000000..9f379d7
--- /dev/null
+++ b/fs/yaffs2/stdlib.h
@@ -0,0 +1 @@
+/* Dummy header for u-boot */