net: hns3: reuse reinitialization interface in the hns3_set_channels

There is already common interface for network device reinitialization,
so hns3_set_channels() should just call them.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>