RDMA/hns: Add new command to support query vf caps

The current resource query for vf caps is driven by the driver,
which is unreasonable.

This patch adds a new command HNS_ROCE_OPC_QUERY_VF_CAPS_NUM
to support obtaining vf caps information from firmware.

Signed-off-by: Yixing Liu <liuyixing1@huawei.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Link: https://lore.kernel.org/r/20230304091555.2241298-2-xuhaoyue1@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>