mailmap: add entry for myself

Signed-off-by: Zhong Li <zhongli_dev@126.com>

.mailmap

@@ -15,7 +15,8 @@
 <ceffmpeg@gmail.com> <cehoyos@rainbow.studorg.tuwien.ac.at>
 <ffmpeg@gyani.pro> <gyandoshi@gmail.com>
 <atomnuker@gmail.com> <rpehlivanov@obe.tv>
-<zhong.li@intel.com> <zhongli_dev@126.com>
+<lizhong1008@gmail.com> <zhong.li@intel.com>
+<lizhong1008@gmail.com> <zhongli_dev@126.com>
 <andreas.rheinhardt@gmail.com> <andreas.rheinhardt@googlemail.com>
 rcombs <rcombs@rcombs.me> <rodger.combs@gmail.com>
 <thilo.borgmann@mail.de> <thilo.borgmann@googlemail.com>