drivers: video: logo: add SPDX comment, remove GPL notice in pnmtologo.c

Signed-off-by: Nikita Romanyuk <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Helge Deller <[e-mail]>

drivers/video/logo/pnmtologo.c

···
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  Convert a logo in ASCII PNM format to C source suitable for inclusion in
  *  the Linux kernel
  *
  *  (C) Copyright 2001-2003 by Geert Uytterhoeven <[e-mail]>
- *
- *  --------------------------------------------------------------------------
- *
- *  This file is subject to the terms and conditions of the GNU General Public
- *  License. See the file COPYING in the main directory of the Linux
- *  distribution for more details.
  */
 
 #include <ctype.h>