Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/sysfs/Kconfig b/fs/sysfs/Kconfig
index b275601..b0fe1cc 100644
--- a/fs/sysfs/Kconfig
+++ b/fs/sysfs/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config SYSFS
 	bool "sysfs file system support" if EXPERT
 	default y