net/mlx5e: CT: Offload established flows

Register driver callbacks with the nf flow table platform.
FT add/delete events will create/delete FTE in the CT/CT_NAT tables.

Restoring the CT state on miss will be added in the following patch.
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h

@@ -15,10 +15,13 @@ struct mlx5e_priv;
 
 struct mlx5_ct_flow;
 
+struct nf_flowtable;
+
 struct mlx5_ct_attr {
 	u16 zone;
 	u16 ct_action;
 	struct mlx5_ct_flow *ct_flow;
+	struct nf_flowtable *nf_ft;
 };
 
 #define zone_to_reg_ct {\