[uboot] create uboot from github:

repo: https://github.com/u-boot/u-boot
	commit: d80bb749fab53da72c4a0e09b8c2d2aaa3103c91

Change-Id: Ie6434426e1ec15bc08bb1832798e371f3fd5fb29

u-boot-2021.10/include/linux/mtd/concat.h

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * MTD device concatenation layer definitions
+ *
+ * Copyright © 2002      Robert Kaiser <rkaiser@sysgo.de>
+ *
+ */
+
+#ifndef MTD_CONCAT_H
+#define MTD_CONCAT_H
+
+struct mtd_info *mtd_concat_create(
+    struct mtd_info *subdev[],  /* subdevices to concatenate */
+    int num_devs,               /* number of subdevices      */
+#ifndef __UBOOT__
+    const char *name);          /* name for the new device   */
+#else
+    char *name);          /* name for the new device   */
+#endif
+
+void mtd_concat_destroy(struct mtd_info *mtd);
+
+#endif