Recognizing Zhihao Cheng's valuable contributions,
let's officially appoint him as a UBI/UBIFS reviewer.
His demonstrated expertise and assistance make him a valuable
addition to the MTD community.

Cc: Zhihao Cheng <chengzhihao1@huawei.com>
Acked-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>