Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/um/drivers/vde_user.c b/arch/um/drivers/vde_user.c
index 64cb630..bc7dc4e 100644
--- a/arch/um/drivers/vde_user.c
+++ b/arch/um/drivers/vde_user.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
- * Licensed under the GPL.
  */
 
 #include <stddef.h>