Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/cpufreq/longrun.c b/drivers/cpufreq/longrun.c
index 542aa9a..64b8689 100644
--- a/drivers/cpufreq/longrun.c
+++ b/drivers/cpufreq/longrun.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * (C) 2002 - 2003  Dominik Brodowski <linux@brodo.de>
  *
- *  Licensed under the terms of the GNU GPL License version 2.
- *
  *  BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
  */