Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/overlayfs/Kconfig b/fs/overlayfs/Kconfig
index 2ef91be..444e2da 100644
--- a/fs/overlayfs/Kconfig
+++ b/fs/overlayfs/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config OVERLAY_FS
 	tristate "Overlay filesystem support"
 	select EXPORTFS