[POWERPC] powerpc/mm/hash_low_32.S: Remove CVS keyword

This removes a CVS keyword that wasn't updated for a long time from a
comment.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/mm/hash_low_32.S

 /*
- *  $Id: hashtable.S,v 1.6 1999/10/08 01:56:15 paulus Exp $
- *
  *  PowerPC version
  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP