Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/lib/crc-itu-t.c b/lib/crc-itu-t.c
index b3219d0..1974b35 100644
--- a/lib/crc-itu-t.c
+++ b/lib/crc-itu-t.c
@@ -1,8 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *      crc-itu-t.c
- *
- * This source code is licensed under the GNU General Public License,
- * Version 2. See the file COPYING for more details.
  */
 
 #include <linux/types.h>