arch/x86: Wrap lines at 80 columns

Fix the following warning detected by checkpatch.pl:

WARNING: line over 80 characters

TEST=Build and run on Galileo Gen2

Change-Id: I3495cd30d1737d9ee728c8a9e72bd426d7a69c37
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18864
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/arch/x86/memset.c

@@ -1,5 +1,6 @@
 /*
- * Copyright (C) 1991,1992,1993,1997,1998,2003, 2005 Free Software Foundation, Inc.
+ * Copyright (C) 1991,1992,1993,1997,1998,2003, 2005 Free Software Foundation,
+ * Inc.
  * This file is part of the GNU C Library.
  *
  * This program is free software; you can redistribute it and/or