Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/virt/lib/irqbypass.c b/virt/lib/irqbypass.c
index 6d2fcd6..43de8ae 100644
--- a/virt/lib/irqbypass.c
+++ b/virt/lib/irqbypass.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * IRQ offload/bypass manager
  *
  * Copyright (C) 2015 Red Hat, Inc.
  * Copyright (c) 2015 Linaro Ltd.
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
  * Various virtualization hardware acceleration techniques allow bypassing or
  * offloading interrupts received from devices around the host kernel.  Posted
  * Interrupts on Intel VT-d systems can allow interrupts to be received