Fix s390 EDDSA HW support in providers.
Fix s390 EDDSA HW support in providers.

Fixes #12476

Note this stopped working when ECX was swapped over to using
providers. The ECX_KEY keygen and exchange were converted, but not the ED
signing support.

Reviewed-by: Matt Caswell <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@openssl.org>
Reviewed-by: Patrick Steuer <0d1e6eb02b051a0fb05954a8a115445ceed2dd93@de.ibm.com>
(Merged from https://github.com/openssl/openssl/pull/13508)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl