clocksource/drivers/mips-gic-timer: Convert to SPDX identifier

The licensing text references explicitely the COPYING file in the kernel
base directory, which is clearly GPL version 2 only.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Serge Semin <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: [email protected]
Acked-by: Serge Semin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Daniel Lezcano <[email protected]>

Author: KAGA-KOKO

drivers/clocksource/mips-gic-timer.c

@@ -1,10 +1,5 @@
-/*
- * 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.
- *
- * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
- */
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
 
 #define pr_fmt(fmt) "mips-gic-timer: " fmt