RDMA/hns: Support congestion control algorithm parameter configuration

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6J5O7



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hns roce support 4 congestion control algorithms. Each algorihm
involves multiple parameters. This patch add port sysfs directory
for each algorithm, which allows users to modify the parameters
of these algorithms.

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>