Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/dma/txx9dmac.h b/drivers/dma/txx9dmac.h
index f6517b9..aa53eaf 100644
--- a/drivers/dma/txx9dmac.h
+++ b/drivers/dma/txx9dmac.h
@@ -1,11 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Driver for the TXx9 SoC DMA Controller
  *
  * Copyright (C) 2009 Atsushi Nemoto
- *
- * 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 TXX9DMAC_H
 #define TXX9DMAC_H