[uboot] create uboot from github:

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

Change-Id: Ie6434426e1ec15bc08bb1832798e371f3fd5fb29

u-boot-2021.10/include/linux/libfdt_env.h

@@ -0,0 +1,33 @@
+#ifdef USE_HOSTCC
+#include "../scripts/dtc/libfdt/libfdt_env.h"
+#else
+/*
+ * This position of the include guard is intentional.
+ * Using the same guard name as that of scripts/dtc/libfdt/libfdt_env.h
+ * prevents it from being included.
+ */
+#ifndef LIBFDT_ENV_H
+#define LIBFDT_ENV_H
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+
+#include <asm/byteorder.h>
+
+typedef __be16 fdt16_t;
+typedef __be32 fdt32_t;
+typedef __be64 fdt64_t;
+typedef __be64 unaligned_fdt64_t __aligned(4);
+
+#define fdt32_to_cpu(x) be32_to_cpu(x)
+#define cpu_to_fdt32(x) cpu_to_be32(x)
+#define fdt64_to_cpu(x) be64_to_cpu(x)
+#define cpu_to_fdt64(x) cpu_to_be64(x)
+
+/* U-Boot: for strtoul in fdt_overlay.c */
+#include <vsprintf.h>
+
+#define strtoul(cp, endp, base)	simple_strtoul(cp, endp, base)
+
+#endif /* LIBFDT_ENV_H */
+#endif