[HIFN]: Indicate asynchronous processing to crypto API

    
hifn_setup_crypto() needs to return -EINPROGRESS on success to indicate
asynchronous processing to the crypto API. This also means it must not
return the errno code returned by hifn_process_queue(), if any.
    
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>