contrib/gitdm: Add ByteDance to the domain map

There is a number of contributors from this domain,
add its own entry to the gitdm domain map.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.com>
Message-Id: <20201006160653.2391972-5-f4bug@amsat.org>
Message-Id: <20201007160038.26953-11-alex.bennee@linaro.org>

contrib/gitdm/domain-map

@@ -6,6 +6,7 @@
 
 amd.com         AMD
 baidu.com       Baidu
+bytedance.com   ByteDance
 cmss.chinamobile.com China Mobile
 citrix.com      Citrix
 greensocs.com   GreenSocs