Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/vhost/Kconfig.vringh b/drivers/vhost/Kconfig.vringh
index 6a4490c..c1fe36a 100644
--- a/drivers/vhost/Kconfig.vringh
+++ b/drivers/vhost/Kconfig.vringh
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config VHOST_RING
 	tristate
 	---help---