Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/efs/Kconfig b/fs/efs/Kconfig
index d020e3c..2df1bac 100644
--- a/fs/efs/Kconfig
+++ b/fs/efs/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config EFS_FS
 	tristate "EFS file system support (read only)"
 	depends on BLOCK