net: hns3/hns: Update the maintainer for the HNS3/HNS ethernet driver

Yisen Zhuang has left the company in September.
Jian Shen will be responsible for maintaining the
hns3/hns driver's code in the future,
so add Jian Shen to the hns3/hns driver's matainer list.

Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>