RDMA/hns: Improve readabilties for dca uverbs

driver inclusion
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I6GT7F



--------------------------------------------------------------------------

Every xxx_HANLDLE equal 1 << UVERBS_ID_NS_SHIFT, but they have different
meanings.

Each xxx_HANDLE represents a specified obj in a specified callback
function, so the code using xxx_HANDLE is more readable.

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