Sergey don't have the time to work ksmbd. He will continue to review
ksmbd works at free time. This patch switches him from maintainer
to reviewer.

Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: NNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: NSteve French <stfrench@microsoft.com>