Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/arc/kernel/arc_hostlink.c b/arch/arc/kernel/arc_hostlink.c
index 47b2a17..08c5196 100644
--- a/arch/arc/kernel/arc_hostlink.c
+++ b/arch/arc/kernel/arc_hostlink.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * arc_hostlink.c: Pseudo-driver for Metaware provided "hostlink" facility
  *
  * Allows Linux userland access to host in absence of any peripherals.
  *
  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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/fs.h>		/* file_operations */