Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/mpls/Kconfig b/net/mpls/Kconfig
index 801ea90..d1ad69b 100644
--- a/net/mpls/Kconfig
+++ b/net/mpls/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # MPLS configuration
 #
@@ -25,6 +26,7 @@
 config MPLS_ROUTING
 	tristate "MPLS: routing support"
 	depends on NET_IP_TUNNEL || NET_IP_TUNNEL=n
+	depends on PROC_SYSCTL
 	---help---
 	 Add support for forwarding of mpls packets.