kernel/configs: Replace GPL boilerplate code with SPDX identifier

The FSF does not reside in "675 Mass Ave, Cambridge" anymore...
let's replace the old GPL boilerplate code with a proper SPDX
identifier instead.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/configs.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * kernel/configs.c
  * Echo the kernel .config file used to build the kernel
@@ -6,21 +7,6 @@
  * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
  * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
  * Copyright (C) 2002 Hewlett-Packard Company
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <linux/kernel.h>