hns3pf: fix hns3_del_tunnel_port()

This function has a copy and paste bug so it accidentally calls the add
function instead of the delete function.

Fixes: 76ad4f0e

 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>