mailmap: add entry for Gao Xiang

Add entry to connect all Gao Xiang's email addresses.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Acked-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
1 file changed