firmware-utils: seama.h: replace LGPL-2.1-or-later boilerplate with SPDX

This was missed because scancode license scanner was confused by a
slightly different than expected license text (96,75% license score).

License text included "file" instead of "library" in the main part of
the licensing info. It also used "The GNU C Library" instead of the
standard "This library" in 2nd and 3rd paragraphs.

The first paragraph clearly mentions LGPL-2.1-or-later and the use of
"file" instead of "library" should not affect licensing.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

tools/firmware-utils/src/seama.h

+// SPDX-License-Identifier: LGPL-2.1-or-later
 /* vi: set sw=4 ts=4: */
 /*
  *	(SEA)ttle i(MA)ge is the image which used in project seattle.
  *
  *	Created by David Hsieh <david_hsieh@alphanetworks.com>
  *	Copyright (C) 2008-2009 Alpha Networks, Inc.
- *
- *	This file is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU Lesser General Public
- *	License as published by the Free Software Foundation; either'
- *	version 2.1 of the License, or (at your option) any later version.
- *
- *	The GNU C Library 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
- *	Lesser General Public License for more details.
- *
- *	You should have received a copy of the GNU Lesser General Public
- *	License along with the GNU C Library; if not, write to the Free
- *	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- *	02111-1307 USA.
  */
 
 #ifndef __SEAMA_HEADER_FILE__