Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c
index 624a11c..ff39f64 100644
--- a/drivers/firmware/dmi-id.c
+++ b/drivers/firmware/dmi-id.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Export SMBIOS/DMI info via sysfs to userspace
  *
  * Copyright 2007, Lennart Poettering
- *
- * Licensed under GPLv2
  */
 
 #include <linux/module.h>