net/mlx5: Remove unused mlx5_query_vport_admin_state

mlx5_query_vport_admin_state() is not used anywhere. Remove it.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>