treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 473

Based on 1 normalized pattern(s):

  this file is subject to the terms and conditions of the gnu general
  public license v2

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: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NAllison Randal <allison@lohutok.net>
Reviewed-by: NEnrico Weigelt <info@metux.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081203.508532280@linutronix.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/dtc/dt_to_config

 #!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0-only
 
 # Copyright 2016 by Frank Rowand
 # Copyright 2016 by Gaurav Minocha
 #
-# This file is subject to the terms and conditions of the GNU General Public
-# License v2.
 
 use strict 'refs';
 use strict subs;