Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/firmware/efi/runtime-map.c b/drivers/firmware/efi/runtime-map.c
index 84a11d0..ad9ddef 100644
--- a/drivers/firmware/efi/runtime-map.c
+++ b/drivers/firmware/efi/runtime-map.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * linux/drivers/efi/runtime-map.c
  * Copyright (C) 2013 Red Hat, Inc., Dave Young <dyoung@redhat.com>
- *
- * This file is released under the GPLv2.
  */
 
 #include <linux/string.h>