Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/autofs/Kconfig b/fs/autofs/Kconfig
index eaebcd4..3b3a6b1 100644
--- a/fs/autofs/Kconfig
+++ b/fs/autofs/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config AUTOFS4_FS
 	tristate "Old Kconfig name for Kernel automounter support"
 	select AUTOFS_FS