[NETFILTER]: nf_conntrack: split out the event cache

This patch splits out the event cache into its own file
nf_conntrack_ecache.c

Signed-off-by: Martin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index d28981c..cf9db03 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -22,10 +22,12 @@
 #include <linux/ipv6.h>
 #include <net/ip6_checksum.h>
 #include <net/checksum.h>
+
 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter_ipv6.h>
 #include <net/netfilter/nf_conntrack_protocol.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
 
 unsigned int nf_ct_udp_timeout __read_mostly = 30*HZ;
 unsigned int nf_ct_udp_timeout_stream __read_mostly = 180*HZ;