The QP can accept receive work requests only when the QP is
in the states that allow them to be submitted.

This patch updates the QP state judgement based on the
specification.
Signed-off-by: NYixian Liu <liuyixian@huawei.com>
Signed-off-by: NLijun Ou <oulijun@huawei.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>