HONG KONG (Reuters) - Trading in shares of Chinese smartphone maker Xiaomi Corp was halted on Wednesday, according to a notice from the Stock Exchange of Hong Kong. It gave no further details on the suspension. Xiaomi has raised $3.91 billion as part of a deal that includes Hong Kong’s largest top-up placement, according to a term sheet seen by Reuters. Reporting by Donny Kwok; Editing by Christopher Cushing