arm: debug: replace license blocks with SPDX

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

arch/arm/include/debug/8250.S

@@ -3,9 +3,7 @@
  *
  *  Copyright (C) 1994-2013 Russell King
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <linux/serial_reg.h>
 

arch/arm/lib/debug.S

@@ -3,9 +3,7 @@
  *
  *  Copyright (C) 1994-1999 Russell King
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier:	GPL-2.0+
  *
  *  32-bit debugging code
  */

include/linux/serial_reg.h

@@ -2,9 +2,8 @@
  * include/linux/serial_reg.h
  *
  * Copyright (C) 1992, 1994 by Theodore Ts'o.
- * 
- * Redistribution of this file is permitted under the terms of the GNU 
- * Public License (GPL)
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
  * 
  * These are the UART port assignments, expressed as offsets from the base
  * register.  These assignments should hold for any serial port based on