Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/net/netns/ieee802154_6lowpan.h b/include/net/netns/ieee802154_6lowpan.h
index 736aeac..95406e1 100644
--- a/include/net/netns/ieee802154_6lowpan.h
+++ b/include/net/netns/ieee802154_6lowpan.h
@@ -16,7 +16,7 @@
 
 struct netns_ieee802154_lowpan {
 	struct netns_sysctl_lowpan sysctl;
-	struct netns_frags	frags;
+	struct fqdir		*fqdir;
 };
 
 #endif