RDMA/core: Add support for the new ARPHRD_UB

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8AL44



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For RDMA over UB Link mode, UB Link replaces the current Ethernet.
Add a new ARP protocol HW ID 38 and enable CM link building and
netdevice event for this mode.

Signed-off-by: Yangyang Li <liyangyang20@huawei.com>
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>