Tunneling: use IP Tunnel stats APIs.

Use common function get calculate rtnl_link_stats64 stats.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index ed0b9e2..11b13ea 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -156,6 +156,7 @@
 config IPV6_SIT
 	tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
 	select INET_TUNNEL
+	select NET_IP_TUNNEL
 	select IPV6_NDISC_NODETYPE
 	default y
 	---help---
@@ -201,6 +202,7 @@
 config IPV6_GRE
 	tristate "IPv6: GRE tunnel"
 	select IPV6_TUNNEL
+	select NET_IP_TUNNEL
 	---help---
 	  Tunneling means encapsulating data of one protocol type within
 	  another protocol and sending it over a channel that understands the