net: hns3: support query vf ring and vector map relation

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

Previously, VF can not query map relation between ring and vector. This
patch adds a new mailbox opcode in PF driver to query map relation between
vf ring and vector, and VF can query this map relation by sending mailbox
message to PF.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Reviewed-by: Peng Li <lipeng321@huawei.com>
Reviewed-by: Zhong Zhaohui <zhongzhaohui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>