lmb: handle more than one DRAM BANK

This fixes the automatic lmb initialization and reservation for boards
with more than one DRAM bank.

This fixes the CVE-2018-18439 and -18440 fixes that only allowed to load
files into the firs DRAM bank from fs and via tftp.

Found-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/net/tftp.c b/net/tftp.c
index eca801a..34488b7 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -606,8 +606,7 @@
 	struct lmb lmb;
 	phys_size_t max_size;
 
-	lmb_init_and_reserve(&lmb, gd->bd->bi_dram[0].start,
-			     gd->bd->bi_dram[0].size, (void *)gd->fdt_blob);
+	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
 
 	max_size = lmb_get_free_size(&lmb, load_addr);
 	if (!max_size)