Add copyright notice on ppc64 iomap files.

Paul cares. I think there's something in the water at IBM
that makes people sticklers ;)

arch/ppc64/kernel/iomap.c

+/*
+ * arch/ppc64/kernel/iomap.c
+ *
+ * ppc64 "iomap" interface implementation.
+ *
+ * (C) Copyright 2004 Linus Torvalds
+ */
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/mm.h>

lib/iomap.c

 /*
  * Implement the default iomap interfaces
+ *
+ * (C) Copyright 2004 Linus Torvalds
  */
 #include <linux/pci.h>
 #include <linux/module.h>