mailmap: add entry for Weiwen Hu

I have graduated from SCUT. My old email is not available now.
Signed-off-by: Weiwen Hu <huweiwen@linux.alibaba.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

.mailmap

@@ -685,6 +685,7 @@ Vivien Didelot <vivien.didelot@gmail.com> <vivien.didelot@savoirfairelinux.com>
 Vlad Dogaru <ddvlad@gmail.com> <vlad.dogaru@intel.com>
 Vladimir Davydov <vdavydov.dev@gmail.com> <vdavydov@parallels.com>
 Vladimir Davydov <vdavydov.dev@gmail.com> <vdavydov@virtuozzo.com>
+Weiwen Hu <huweiwen@linux.alibaba.com> <sehuww@mail.scut.edu.cn>
 WeiXiong Liao <gmpy.liaowx@gmail.com> <liaoweixiong@allwinnertech.com>
 Wen Gong <quic_wgong@quicinc.com> <wgong@codeaurora.org>
 Wesley Cheng <quic_wcheng@quicinc.com> <wcheng@codeaurora.org>