Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/sh/boards/mach-ecovec24/sdram.S b/arch/sh/boards/mach-ecovec24/sdram.S
index 3963c6f..d2f2691 100644
--- a/arch/sh/boards/mach-ecovec24/sdram.S
+++ b/arch/sh/boards/mach-ecovec24/sdram.S
@@ -1,11 +1,8 @@
-/*
+/* SPDX-License-Identifier: GPL-2.0
+ *
  * Ecovec24 sdram self/auto-refresh setup code
  *
  *  Copyright (C) 2009 Magnus Damm
- *
- * 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.
  */
 
 #include <linux/sys.h>