crypto: akcipher - add akcipher declarations needed by templates.

Add a struct akcipher_instance and struct akcipher_spawn similar to
how AEAD declares them and the macros for converting to/from
crypto_instance/crypto_spawn.  Also add register functions to
avoid exposing crypto_akcipher_type.

Signed-off-by: Andrew Zaborowski <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
2 files changed