RDMA/erdma: Add erdma_modify_qp_rocev2() interface

The QP state machines in the RoCEv2 and iWARP protocols are
different. To handle these differences for the erdma RoCEv2
device, we provide the erdma_modify_qp_rocev2() interface,
which transitions the QP state and modifies QP attributes
accordingly.

Signed-off-by: Boshi Yu <boshiyu@linux.alibaba.com>
Link: https://patch.msgid.link/20241211020930.68833-6-boshiyu@linux.alibaba.com


Reviewed-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>