RDMA/hns: Fix query destination qpn

The bit width of dqpn is 24 bits, using u8 will cause truncation error.

Fixes: 926a01dc ("RDMA/hns: Add QP operations support for hip08 SoC")
Link: https://lore.kernel.org/r/1629985056-57004-2-git-send-email-liangwenpeng@huawei.com


Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>