Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/sh/boards/mach-lboxre2/Makefile b/arch/sh/boards/mach-lboxre2/Makefile
index e9ed140..0fbd082 100644
--- a/arch/sh/boards/mach-lboxre2/Makefile
+++ b/arch/sh/boards/mach-lboxre2/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the L-BOX RE2 specific parts of the kernel
 # Copyright (c) 2007 Nobuhiro Iwamatsu
diff --git a/arch/sh/boards/mach-lboxre2/irq.c b/arch/sh/boards/mach-lboxre2/irq.c
index 8aa171a..a250e3b 100644
--- a/arch/sh/boards/mach-lboxre2/irq.c
+++ b/arch/sh/boards/mach-lboxre2/irq.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * linux/arch/sh/boards/lboxre2/irq.c
  *
  * Copyright (C) 2007 Nobuhiro Iwamatsu
  *
  * NTT COMWARE L-BOX RE2 Support.
- *
- * 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/init.h>
 #include <linux/interrupt.h>
diff --git a/arch/sh/boards/mach-lboxre2/setup.c b/arch/sh/boards/mach-lboxre2/setup.c
index 6660622..20d01b4 100644
--- a/arch/sh/boards/mach-lboxre2/setup.c
+++ b/arch/sh/boards/mach-lboxre2/setup.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * linux/arch/sh/boards/lbox/setup.c
  *
  * Copyright (C) 2007 Nobuhiro Iwamatsu
  *
  * NTT COMWARE L-BOX RE2 Support
- *
- * 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/init.h>