RDMA/hns: Fix a missing default value for invalid congest type

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8HYSU



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When the congest type pf a QP is invalid, the algorithm param will be
set to DCQCN param by default. In this case, the congest type should
also be set to DCQCN accordingly, or the algorithm may not take effect
properly.

Fixes: a7052c43 ("RDMA/hns: Fix default congest type")
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>