pata_falcon: clarify license version and use SPDX header

- clarify license version (it should be GPL 2.0)
- use SPDX header

Cc: Michael Schmitz <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

drivers/ata/pata_falcon.c

···
+// SPDX-License-Identifier: GPL-2.0
+
 /*
  * Atari Falcon PATA controller driver
  *
···
  * Based on falconide.c:
  *
  *     Created 12 Jul 1997 by Geert Uytterhoeven
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
  */
 
 #include <linux/kernel.h>
···
 
 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 MODULE_VERSION(DRV_VERSION);