MAINTAINERS: SOFT-ROCE: Change Zhu Yanjun's email address

Change Zhu's working email to his private one.

Link: https://lore.kernel.org/r/20201203190659.126932-1-leon@kernel.org


Signed-off-by: Zhu Yanjun <yanjunz@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>