UNIC: Support UDMA client management

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I850RQ


CVE: NA

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Add UDMA client instance to hns3, managing UDMA client in hns3, including
struct and interface functions.

This patch creates new files to host the function interfaces of the UB.

Signed-off-by: Fengyan Mu <mufengyan@hisilicon.com>
Signed-off-by: Junxin Chen <chenjunxin1@huawei.com>