MAINTAINERS: Update maintainers of HiSilicon RoCE

Lijun has moved to work in other technical areas, and Wenpeng will
maintain this modules instead of him.

Link: https://lore.kernel.org/r/1625741958-51363-1-git-send-email-liweihang@huawei.com


Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>