lenovo/x230: Add missing copyright line.

Change-Id: I5ecd25e23cebf83d4ae9300307aaac527e05c377
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4778
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/mainboard/lenovo/x230/dsdt.asl b/src/mainboard/lenovo/x230/dsdt.asl
index db2a793..12f40f8 100644
--- a/src/mainboard/lenovo/x230/dsdt.asl
+++ b/src/mainboard/lenovo/x230/dsdt.asl
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2007-2009 coresystems GmbH
  * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ * Copyright (C) 2014 Vladimir Serbinenko
  *
  * 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