RDMA/hns: Add support for extended atomic in userspace

To support extended atomic operations including cmp & swap and fetch & add
of 8 bytes, 16 bytes, 32 bytes, 64 bytes in userspace, some field in qpc
should be configured.

Link: https://lore.kernel.org/r/1579052546-11746-1-git-send-email-liweihang@huawei.com


Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>