RDMA/hns: Support DSCP of userspace

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XYHV



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This patch add support to config dscp map to tc by
nic interface get_dscp_prio. Driver will convert
mapping relationship from dscp-prio to dscp-tc.

The dependency patch is as follows:
7a1313b3 ("net: hns3: add support config dscp map to tc")

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>