net/sched: act_ct: Enable hardware offload of flow table entires

Pass the zone's flow table instance on the flow action to the drivers.
Thus, allowing drivers to register FT add/del/stats callbacks.

Finally, enable hardware offload on the flow table instance.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/flow_offload.h

@@ -225,6 +225,7 @@ struct flow_action_entry {
 		struct {				/* FLOW_ACTION_CT */
 			int action;
 			u16 zone;
+			struct nf_flowtable *flow_table;
 		} ct;
 		struct {
 			unsigned long cookie;