treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_390.RULE

Based on the normalized pattern:

    this software file (the file ) is distributed by marvell international
    ltd under the terms of the gnu general public license version 2 june
    1991 (the license ) you may use redistribute and/or modify this file
    in accordance with the terms and conditions of the license a copy of
    which is available by writing to the free software foundation inc 51
    franklin street fifth floor boston ma 02110-1301 usa or on the
    worldwide web at http://www

 gnu org/licenses/old-licenses/gpl-2 0 txt
    the file is distributed as-is without warranty of any kind and the
    implied warranties of merchantability or fitness for a particular
    purpose are expressly disclaimed the license provides additional
    details about this warranty disclaimer

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>