RDMA/hns: fix the error of missing GID in RoCE bonding mode 1

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I63IM5



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In the existing hns RoCE code, ib_dev->ops.get_netdev is not set, which
cause that only one slave will be assigned IP-based GID in RoCE bonding
mode 1.

This patch adds hns_roce_get_netdev() and set the function to
ib_dev->ops.get_netdev so that IB-Core can assign GID to different
net device according to the active slave in mode 1.

Fixes: e62a2027 ("RDMA/hns: support RoCE bonding")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>