net/hns3: support wait in link update

net/hns3: support wait in link update

There are two APIs in ethdev layer to get link status of device, namely,
"rte_eth_link_get" and "rte_eth_link_get_nowait". When the device link
is unstable or auto-negotiation is in progress, the first API supports
the function of waiting for the NIC to link up, and the maximum waiting
time is 9 seconds based on DPDK Documentation. For the hns3 PMD driver,
the link can be established within 2 seconds.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>