net/mlx5e: Offload TC flow counters only when supported

net/mlx5e: Offload TC flow counters only when supported

Currenly, the code that programs the flow actions into the firmware
doesn't check if was actually asked to offload the statistics, fix that.

Fixes: aad7e08d39bd ('net/mlx5e: Hardware offloaded flower filter statistics support')
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>