Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/sh/include/asm/gpio.h b/arch/sh/include/asm/gpio.h
index 7dfe15e..3519188 100644
--- a/arch/sh/include/asm/gpio.h
+++ b/arch/sh/include/asm/gpio.h
@@ -1,13 +1,10 @@
-/*
+/* SPDX-License-Identifier: GPL-2.0
+ *
  *  include/asm-sh/gpio.h
  *
  * Generic GPIO API and pinmux table support for SuperH.
  *
  * Copyright (c) 2008 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.
  */
 #ifndef __ASM_SH_GPIO_H
 #define __ASM_SH_GPIO_H