treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_8.RULE

Based on the normalized pattern:

    this program is free software you can redistribute it and/or modify it
    under the terms of the gnu general public license version 2 as
    published by the free software foundation

extracted by the scancode license scanner the SPDX license identifier

    GPL-2.0-only

has been chosen to replace the boilerplate/reference.
Reviewed-by: Allison Randal <allison@lohutok.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/driver-api/vfio-mediated-device.rst

+.. SPDX-License-Identifier: GPL-2.0-only
 .. include:: <isonum.txt>
 
 =====================
@@ -8,9 +9,6 @@ VFIO Mediated devices
 :Author: Neo Jia <cjia@nvidia.com>
 :Author: Kirti Wankhede <kwankhede@nvidia.com>
 
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License version 2 as
-published by the Free Software Foundation.
 
 
 Virtual Function I/O (VFIO) Mediated devices[1]

arch/arm/boot/bootp/bootp.lds

+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *  linux/arch/arm/boot/bootp/bootp.lds
  *
  *  Copyright (C) 2000-2002 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 OUTPUT_ARCH(arm)
 ENTRY(_start)

include/linux/input/elan-i2c-ids.h

+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Elan I2C/SMBus Touchpad device whitelist
  *
@@ -11,10 +12,6 @@
  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  * copyright (c) 2011-2012 Google, Inc.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- *
  * Trademarks are the property of their respective owners.
  */