mlx4: setup xdp_rxq_info

Driver hook points for xdp_rxq_info:
 * reg  : mlx4_en_create_rx_ring
 * unreg: mlx4_en_destroy_rx_ring

Tested on actual hardware.

Cc: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>