Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index c4ecb24..cb9c8b6 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  Port on Texas Instruments TMS320C6x architecture
  *
  *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
- *
- *  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.
- *
  */
 #include <linux/module.h>
 #include <linux/unistd.h>