x86_64: update copyright notice

Signed-off-by: NMuli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/x86_64/kernel/pci-calgary.c

 /*
  * Derived from arch/powerpc/kernel/iommu.c
  *
- * Copyright (C) IBM Corporation, 2006
+ * Copyright IBM Corporation, 2006-2007
  * Copyright (C) 2006  Jon Mason <jdmason@kudzu.us>
  *
  * Author: Jon Mason <jdmason@kudzu.us>