RDMA/hns: Cleanup for a spelling error of Asynchronous

Fixed a spelling error for Asynchronous.

Link: https://lore.kernel.org/r/20220922123315.3732205-2-xuhaoyue1@hisilicon.com


Signed-off-by: Guofeng Yue <yueguofeng@hisilicon.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>