net/hns3: support VF

net/hns3: support VF

This patch adds support for hns3 VF PMD driver.

In current version, we only support VF device is bound to vfio_pci or
igb_uio and then driven by DPDK driver when PF is driven by kernel mode
hns3 ethdev driver, VF is not supported when PF is driven by DPDK
driver.

Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Chunsong Feng <fengchunsong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Signed-off-by: Hao Chen <chenhao164@huawei.com>
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Chengchang Tang <tangchengchang@hisilicon.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>