Enable pkeyutl to use Ed448 and Ed25519

With the recent addition of the -rawin option it should be possible for
pkeyutl to sign and verify with Ed448 and Ed2559. The main remaining
stumbling block is that those algorirthms only support "oneshot" operation.
This commit enables pkeyutl to handle that.

Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/8431)