Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/dt-bindings/clock/imx27-clock.h b/include/dt-bindings/clock/imx27-clock.h
index 148b053..1ff448b 100644
--- a/include/dt-bindings/clock/imx27-clock.h
+++ b/include/dt-bindings/clock/imx27-clock.h
@@ -1,10 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
- *
- * 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 __DT_BINDINGS_CLOCK_IMX27_H