x86: unify power/cpu_(32|64) copyright notes

In this step, we do unify the copyright notes for both files
cpu_32.c and cpu_64.c, making such files exactly the same.
It's the last step before the actual unification, that will
rename one of them to cpu.c and remove the other one.
Signed-off-by: Sergio Luis <sergio@larces.uece.br>
Signed-off-by: Lauro Salmito <laurosalmito@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

arch/x86/power/cpu_32.c

 /*
- * Suspend support specific for i386.
+ * Suspend and hibernation support for i386/x86-64.
  *
  * Distribute under GPLv2
  *
+ * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
  * Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
  * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
  */

arch/x86/power/cpu_64.c

 /*
- * Suspend and hibernation support for x86-64
+ * Suspend support specific for i386/x86-64.
  *
  * Distribute under GPLv2
  *