Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/acpi/dptf/dptf_power.c b/drivers/acpi/dptf/dptf_power.c
index e1c2425..eb58fc4 100644
--- a/drivers/acpi/dptf/dptf_power.c
+++ b/drivers/acpi/dptf/dptf_power.c
@@ -1,16 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * dptf_power:  DPTF platform power driver
  * Copyright (c) 2016, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
  */
 
 #include <linux/kernel.h>
@@ -31,8 +22,7 @@
 			   struct device_attribute *attr,\
 			   char *buf)\
 {\
-	struct platform_device *pdev = to_platform_device(dev);\
-	struct acpi_device *acpi_dev = platform_get_drvdata(pdev);\
+	struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
 	unsigned long long val;\
 	acpi_status status;\
 \