firmware-utils: mkmylofw: replace GPL-2.0-or-later boilerplate with SPDX

This was missed because scancode license scanner was confused by a
comment about (no) copyrights in the init_crc_table().

Cc: Gabor Juhos <juhosg@openwrt.org>
Cc: Gabor Juhos <juhosg@freemail.hu>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

tools/firmware-utils/src/mkmylofw.c

@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Copyright (C) 2006-2008 Gabor Juhos <juhosg@openwrt.org>
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the
- *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- *  Boston, MA  02110-1301, USA.
- *
  */
 
 #include <stdio.h>