Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/c6x/kernel/entry.S b/arch/c6x/kernel/entry.S
index 2721c90..4332a10 100644
--- a/arch/c6x/kernel/entry.S
+++ b/arch/c6x/kernel/entry.S
@@ -1,3 +1,4 @@
+; SPDX-License-Identifier: GPL-2.0-only
 ;
 ;  Port on Texas Instruments TMS320C6x architecture
 ;
@@ -5,10 +6,6 @@
 ;  Author: Aurelien Jacquiot (aurelien.jacquiot@virtuallogix.com)
 ;  Updated for 2.6.34: Mark Salter <msalter@redhat.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/sys.h>
 #include <linux/linkage.h>