Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/c6x/platforms/dscr.c b/arch/c6x/platforms/dscr.c
index f848a65..4571615 100644
--- a/arch/c6x/platforms/dscr.c
+++ b/arch/c6x/platforms/dscr.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  Device State Control Registers driver
  *
  *  Copyright (C) 2011 Texas Instruments Incorporated
  *  Author: 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.
  */
 
 /*