RDMA/ocrdma: Fix the request length for RDMA_QUERY_QP mailbox command to FW.

Fix ocrdma_query_qp to pass correct mailbox request length to FW.

Signed-off-by: Mitesh Ahuja <mitesh.ahuja@avagotech.com>
Signed-off-by: Selvin Xavier <selvin.xavier@avagotech.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>