RDMA/hns: Fix roce v1 traffic_class problem

driver inclusion
category: Bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I61FED



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When it is roce v1, if the traffic_class value exceeds 63,
the following error will appear:
modify qp to 2 state failed(22)
Failed to create AH

This is because the driver intercepts the over-spec value
in set dscp, and there is no need to obtain dscp for roce v1,
so the driver does not intercept v1.

Fixes: 11ef2ec6 ("RDMA/hns: Support DSCP of userspace")
Signed-off-by: Yixing Liu <liuyixing1@huawei.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>