RDMA/hns: Fix gid idx issue caused by free mr

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5MQLB



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If the gid or mtu are changed after the driver is initialized, an error
will happen as following:

[   29.612240] __ib_cache_gid_add: unable to add gid
fe80:0000:0000:0000:4600:4dff:fe22:abb5 error=-28
[61807.380991] hns3 0000:7d:00.0 hns_0: attr path_mtu(1)invalid while
modify qp

Fixes: 70f92521 ("RDMA/hns: Use the reserved loopback QPs to free MR
before destroying MPT")

Signed-off-by: Yixing Liu <liuyixing1@huawei.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: zhengfeng luo <luozhengfeng@h-partners.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>