.mailmap: add an alias for Zhongmin Wu

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index ea7b9e5..b844054 100644
--- a/.mailmap
+++ b/.mailmap
@@ -629,6 +629,8 @@
 
 Zhenyu Wang <zhenyuw@linux.intel.com> Wang Zhenyu <zhenyu.z.wang@intel.com>
 
+Zhongmin Wu <zhongmin.wu@intel.com>
+
 Zack Rusin <zackr@vmware.com> <zack@kde.org>
 Zack Rusin <zackr@vmware.com> <zack@pixel.(none)>
 Zack Rusin <zackr@vmware.com> <zack@tungstengraphics.com>