Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/soc/codecs/ml26124.c b/sound/soc/codecs/ml26124.c
index a5fa490..55823bc 100644
--- a/sound/soc/codecs/ml26124.c
+++ b/sound/soc/codecs/ml26124.c
@@ -1,18 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
- *
- * This program is free software; you can redistribute 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
  */
 
 #include <linux/module.h>
@@ -68,7 +56,6 @@
 static const DECLARE_TLV_DB_SCALE(mingain, -1200, 600, 0);
 static const DECLARE_TLV_DB_SCALE(maxgain, -675, 600, 0);
 static const DECLARE_TLV_DB_SCALE(boost_vol, -1200, 75, 0);
-static const DECLARE_TLV_DB_SCALE(ngth, -7650, 150, 0);
 
 static const char * const ml26124_companding[] = {"16bit PCM", "u-law",
 						  "A-law"};