Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/virtio/virtio-trace/trace-agent.c b/tools/virtio/virtio-trace/trace-agent.c
index 0a0a7dd..cdfe77c 100644
--- a/tools/virtio/virtio-trace/trace-agent.c
+++ b/tools/virtio/virtio-trace/trace-agent.c
@@ -1,12 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Guest agent for virtio-trace
  *
  * Copyright (C) 2012 Hitachi, Ltd.
  * Created by Yoshihiro Yunomae <yoshihiro.yunomae.ez@hitachi.com>
  *            Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
- *
- * Licensed under GPL version 2 only.
- *
  */
 
 #define _GNU_SOURCE