Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/sh/include/asm/vga.h b/arch/sh/include/asm/vga.h
index 06a5de8..089fbdc 100644
--- a/arch/sh/include/asm/vga.h
+++ b/arch/sh/include/asm/vga.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ASM_SH_VGA_H
 #define __ASM_SH_VGA_H