mailmap: Add entry for Yu-Chen Lin

I have two mail address, add entries for
showing author and email correctly.
Signed-off-by: NYu-Chen Lin <npes87184@gmail.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: NYu-Chen Lin <yuchenlin@synology.com>
Message-Id: <20200206125504.7150-1-npes87184@gmail.com>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>

.mailmap

@@ -152,7 +152,8 @@ Xiaoqiang Zhao <zxq_yx_007@163.com>
 Xinhua Cao <caoxinhua@huawei.com>
 Xiong Zhang <xiong.y.zhang@intel.com>
 Yin Yin <yin.yin@cs2c.com.cn>
-yuchenlin <npes87184@gmail.com>
+Yu-Chen Lin <npes87184@gmail.com>
+Yu-Chen Lin <npes87184@gmail.com> <yuchenlin@synology.com>
 YunQiang Su <syq@debian.org>
 YunQiang Su <ysu@wavecomp.com>
 Yuri Pudgorodskiy <yur@virtuozzo.com>