treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 121

Based on 1 normalized pattern(s):

  licensed under the gplv2 or at your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190523091651.323272658@linutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Adaptrum Anarion DWMAC glue layer
  *
  * Copyright (C) 2017, Adaptrum, Inc.
  * (Written by Alexandru Gagniuc <alex.g at adaptrum.com> for Adaptrum, Inc.)
- * Licensed under the GPLv2 or (at your option) any later version.
  */
 
 #include <linux/io.h>