fdtdec: Honor #address-cells and #size-cells in fdtdec_add_reserved_memory()

At present fdtdec_add_reserved_memory() calls fdtdec_get_addr_size()
to get address and size for the subnodes of /reserved-memory node.

We should honor #address-cells and #size-cells properties in the
parent node.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 42f7a25..0dd7ff1 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1297,7 +1297,8 @@
 		fdt_addr_t addr;
 		fdt_size_t size;
 
-		addr = fdtdec_get_addr_size(blob, node, "reg", &size);
+		addr = fdtdec_get_addr_size_fixed(blob, node, "reg", 0, na, ns,
+						  &size, false);
 		if (addr == FDT_ADDR_T_NONE) {
 			debug("failed to read address/size for %s\n", name);
 			continue;