RDMA/hns: Fix inconsistency between QPC's sl and DB's sl in roce v1

driver inclusion
category: Bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I61F1Q



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Running roce v1 business on fpga, the following error occurs:
hns3 0000:35:00.0 hns_0: local work queue 0x2 catast error,
sub_event type is: 4

This is because the sl transmitted by the roce v1 service
driver after set dscp is incorrect, which makes the sl of
db inconsistent with the sl of qpc, resulting in an sl error
on the hardware.

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>