RDMA/hns: Remove unuseful member

For struct hns_roce_cmdq, toggle is unused and
delete it.

Signed-off-by: Lang Cheng <chenglang@huawei.com>
Link: https://lore.kernel.org/r/1565343666-73193-8-git-send-email-oulijun@huawei.com


Signed-off-by: Doug Ledford <dledford@redhat.com>