Move FDT_RAMDISK_OVERHEAD from fdt.h to libfdt_env.h

The define should not have been put in fdt.h originally, libfdt_env.h
is the proper place for target-specific customizations.
Signed-off-by: NGerald Van Baren <vanbaren@cideas.com>

include/fdt.h

@@ -108,6 +108,4 @@ struct fdt_property {
 #define FDT_V16_SIZE	FDT_V3_SIZE
 #define FDT_V17_SIZE	(FDT_V16_SIZE + sizeof(fdt32_t))
 
-/* adding a ramdisk needs 0x44 bytes in version 2008.10 */
-#define FDT_RAMDISK_OVERHEAD	0x80
 #endif /* _FDT_H */

include/libfdt_env.h

@@ -35,4 +35,7 @@ typedef __be64 fdt64_t;
 #define fdt64_to_cpu(x)		be64_to_cpu(x)
 #define cpu_to_fdt64(x)		cpu_to_be64(x)
 
+/* adding a ramdisk needs 0x44 bytes in version 2008.10 */
+#define FDT_RAMDISK_OVERHEAD	0x80
+
 #endif /* _LIBFDT_ENV_H */