RDMA/hns: Fix context dca configuration

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I87LCF



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HNS_ROCE_UCTX_RSP_DCA_FLAGS is set only if HNS_ROCE_UCTX_CONFIG_DCA
is configured.

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>