RDMA/hns: Deliver net device event to ofed

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5Z2DS



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Driver can notify ulp with IB event when net link down/up.

Signed-off-by: Lang Cheng <chenglang@huawei.com>
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>