Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/sunrpc/addr.c b/net/sunrpc/addr.c
index 2e0a6f9..d024af4 100644
--- a/net/sunrpc/addr.c
+++ b/net/sunrpc/addr.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2009, Oracle.  All rights reserved.
  *