mailmap: add entry to connect my email addresses

I've used several email accounts to contribute codes, samsung's one
is obsolete, so let me add entry to map them, in order to let people
find me easily when they blame my codes.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

.mailmap

@@ -47,6 +47,8 @@ Boris Brezillon <bbrezillon@kernel.org> <b.brezillon.dev@gmail.com>
 Boris Brezillon <bbrezillon@kernel.org> <b.brezillon@overkiz.com>
 Brian Avery <b.avery@hp.com>
 Brian King <brking@us.ibm.com>
+Chao Yu <chao@kernel.org> <chao2.yu@samsung.com>
+Chao Yu <chao@kernel.org> <yuchao0@huawei.com>
 Christoph Hellwig <hch@lst.de>
 Christophe Ricard <christophe.ricard@gmail.com>
 Corey Minyard <minyard@acm.org>