cpu/allwinner: Update license headers

These licence headers were not compliant with the coreboot standard.

Change-Id: I85bb5f971ab1f8ac3e9589f712370fbf09716b67
Signed-off-by: Damien Roth <yves.r.roth@gmail.com>
Reviewed-on: https://review.coreboot.org/13287
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/allwinner/a10/uart_console.c

@@ -1,9 +1,20 @@
 /*
- * Glue to UART code to enable serial console
+ * This file is part of the coreboot project.
  *
  * Copyright 2013 Google Inc.
  * Copyright (C) 2013  Alexandru Gagniuc <mr.nuke.me@gmail.com>
- * Subject to the GNU GPL v2, or (at your option) any later version.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Glue to UART code to enable serial console
  */
 
 #include <types.h>