dtc: Use libfdt/fdt.h instead of flat_dt.h

In the dtc tree, both flat_dt.h and libfdt/fdt.h have structures and
constants relating to the flattened device tree format derived from
asm-powerpc/prom.h in the kernel.  The former is used in dtc, the
latter in libfdt.

libfdt/fdt.h is the more recent, revised version, so use that
throughout, removing flat_dt.h.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/data.c b/data.c
index 2602249..1836f08 100644
--- a/data.c
+++ b/data.c
@@ -246,9 +246,9 @@
 	return data_append_data(d, &beword, sizeof(beword));
 }
 
-struct data data_append_re(struct data d, struct reserve_entry *re)
+struct data data_append_re(struct data d, struct fdt_reserve_entry *re)
 {
-	struct reserve_entry bere;
+	struct fdt_reserve_entry bere;
 
 	bere.address = cpu_to_be64(re->address);
 	bere.size = cpu_to_be64(re->size);