Use the NF flow tables infrastructure for CT offload.

Create a nf flow table per zone.

Next patches will add FT entries to this table, and do
the software offload.

Signed-off-by: Paul Blakey <redacted>
Reviewed-by: Jiri Pirko <redacted>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c |   1 +
 include/net/tc_act/tc_ct.h                      |   2 +
 net/sched/Kconfig                               |   2 +-
 net/sched/act_ct.c                              | 159 +++++++++++++++++++++++-
 4 files changed, 162 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 70b5fe2..eb16136 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -45,6 +45,7 @@
 #include <net/tc_act/tc_tunnel_key.h>
 #include <net/tc_act/tc_pedit.h>
 #include <net/tc_act/tc_csum.h>
+#include <net/tc_act/tc_ct.h>
 #include <net/arp.h>
 #include <net/ipv6_stubs.h>
 #include "en.h"