Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/mips/math-emu/dp_maddf.c b/arch/mips/math-emu/dp_maddf.c
index 7ea2f82..3da0ce4 100644
--- a/arch/mips/math-emu/dp_maddf.c
+++ b/arch/mips/math-emu/dp_maddf.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * IEEE754 floating point arithmetic
  * double precision: MADDF.f (Fused Multiply Add)
@@ -6,10 +7,6 @@
  * MIPS floating point support
  * Copyright (C) 2015 Imagination Technologies, Ltd.
  * Author: Markos Chandras <markos.chandras@imgtec.com>
- *
- *  This program is free software; you can distribute it and/or modify it
- *  under the terms of the GNU General Public License as published by the
- *  Free Software Foundation; version 2 of the License.
  */
 
 #include "ieee754dp.h"