of/flattree: merge dt_mem_next_cell

Merge common code between PowerPC and Microblaze

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>

drivers/of/fdt.c

@@ -432,6 +432,14 @@ int __init early_init_dt_scan_root(unsigned long node, const char *uname,
 	return 1;
 }
 
+u64 __init dt_mem_next_cell(int s, u32 **cellp)
+{
+	u32 *p = *cellp;
+
+	*cellp = p + s;
+	return of_read_number(p, s);
+}
+
 /**
  * unflatten_device_tree - create tree of device_nodes from flat blob
  *