crypto: prefix module autoloading with "crypto-"

This prefixes all crypto module loading with "crypto-" so we never run
the risk of exposing module auto-loading to userspace via a crypto API,
as demonstrated by Mathias Krause:

https://lkml.org/lkml/2013/3/4/70

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
static int hmac_sha1_digest(struct ahash_request *req)
{
	int ret2, ret1;

	ret1 = hmac_sha1_init(req);
	if (ret1)
		goto out;

	ret1 = ahash_update(req);
	ret2 = ahash_final(req);

out:
	return ret1 ? ret1 : ret2;
}

static int hmac_sha1_digest(struct ahash_request *req)
{
	int ret2, ret1;

	ret1 = hmac_sha1_init(req);
	if (ret1)
		goto out;

	ret1 = ahash_update(req);
	ret2 = ahash_final(req);

out:
	return ret1 ? ret1 : ret2;
}
