openvswitch: Remove conntrack Kconfig option.

There's no particular desire to have conntrack action support in Open
vSwitch as an independently configurable bit, rather just to ensure
there is not a hard dependency. This exposed option doesn't accurately
reflect the conntrack dependency when enabled, so simplify this by
removing the option. Compile the support if NF_CONNTRACK is enabled.

Fixes: 7f8a436eaa2c ("openvswitch: Add conntrack action")
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/openvswitch/conntrack.h b/net/openvswitch/conntrack.h
index 3cb3066..43f5dd7 100644
--- a/net/openvswitch/conntrack.h
+++ b/net/openvswitch/conntrack.h
@@ -19,7 +19,7 @@
 struct ovs_conntrack_info;
 enum ovs_key_attr;
 
-#if defined(CONFIG_OPENVSWITCH_CONNTRACK)
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
 void ovs_ct_init(struct net *);
 void ovs_ct_exit(struct net *);
 bool ovs_ct_verify(struct net *, enum ovs_key_attr attr);
@@ -82,5 +82,5 @@
 }
 
 static inline void ovs_ct_free_action(const struct nlattr *a) { }
-#endif
+#endif /* CONFIG_NF_CONNTRACK */
 #endif /* ovs_conntrack.h */