treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 387

Based on 1 normalized pattern(s):

  this code is released under the gnu general public license version 2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 1 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Armijn Hemel <armijn@tjaldur.nl>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531081037.657778837@linutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/x86/pci/mmconfig_32.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) 2004 Matthew Wilcox <matthew@wil.cx>
  * Copyright (C) 2004 Intel Corp.
- *
- * This code is released under the GNU General Public License version 2.
  */
 
 /*