Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/timeriomem-rng.h b/include/linux/timeriomem-rng.h
index 3e00122..672df7f 100644
--- a/include/linux/timeriomem-rng.h
+++ b/include/linux/timeriomem-rng.h
@@ -1,13 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * linux/include/linux/timeriomem-rng.h
  *
  * Copyright (c) 2009 Alexander Clouter <alex@digriz.org.uk>
- *
- * 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.
  */
 
+#ifndef _LINUX_TIMERIOMEM_RNG_H
+#define _LINUX_TIMERIOMEM_RNG_H
+
 struct timeriomem_rng_data {
 	void __iomem		*address;
 
@@ -17,3 +17,5 @@
 	/* bits of entropy per 1024 bits read */
 	unsigned int		quality;
 };
+
+#endif /* _LINUX_TIMERIOMEM_RNG_H */