Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/xdp/Kconfig b/net/xdp/Kconfig
index 90e4a71..71af2fe 100644
--- a/net/xdp/Kconfig
+++ b/net/xdp/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config XDP_SOCKETS
 	bool "XDP sockets"
 	depends on BPF_SYSCALL
@@ -5,3 +6,11 @@
 	help
 	  XDP sockets allows a channel between XDP programs and
 	  userspace applications.
+
+config XDP_SOCKETS_DIAG
+	tristate "XDP sockets: monitoring interface"
+	depends on XDP_SOCKETS
+	default n
+	help
+	  Support for PF_XDP sockets monitoring interface used by the ss tool.
+	  If unsure, say Y.