Hexagon: update copyright dates

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>

arch/hexagon/kernel/asm-offsets.c

@@ -5,7 +5,7 @@
  * Kevin Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
  * Copyright (C) 2000 MIPS Technologies, Inc.
  *
- * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and