net/mlx5: E-Switch, Avoid ACLs in the offloads mode

When we are in the switchdev/offloads mode, HW matching is done as
dictated by the offloaded rules and hence we don't need to enable
the ACLs mechanism used by the legacy mode.

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>