crypto: rng - Convert low-level crypto_rng to new style

This patch converts the low-level crypto_rng interface to the
"new" style.

This allows existing implementations to be converted over one-
by-one.  Once that is complete we can then remove the old rng
interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/internal/rng.h

@@ -18,6 +18,9 @@
 
 extern const struct crypto_type crypto_rng_type;
 
+int crypto_register_rng(struct rng_alg *alg);
+void crypto_unregister_rng(struct rng_alg *alg);
+
 static inline void *crypto_rng_ctx(struct crypto_rng *tfm)
 {
 	return crypto_tfm_ctx(&tfm->base);