Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/nfc/s3fwrn5/Makefile b/drivers/nfc/s3fwrn5/Makefile
index ddfa7be..d0ffa35 100644
--- a/drivers/nfc/s3fwrn5/Makefile
+++ b/drivers/nfc/s3fwrn5/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Makefile for Samsung S3FWRN5 NFC driver
 #