RDMA/hns: Set the unsupported wr opcode

hip06 does not support IB_WR_LOCAL_INV, so the ps_opcode should be set to
an invalid value instead of being left uninitialized.

Fixes: 9a443537 ("IB/hns: Add driver files for hns RoCE driver")
Fixes: a2f3d447 ("RDMA/hns: Avoid unncessary initialization")
Link: https://lore.kernel.org/r/1600350615-115217-1-git-send-email-oulijun@huawei.com


Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>