EVP: fix keygen for EVP_PKEY_RSA_PSS

EVP: fix keygen for EVP_PKEY_RSA_PSS

This commit attempts to fix the an issue when generating a key of type
EVP_PKEY_RSA_PSS. Currently, EVP_PKEY_CTX_set_rsa_keygen_bits will
return -1 if the key id is not of type EVP_PKEY_RSA. This commit adds
EVP_PKEY_RSA_PSS to also be accepted.

The macro EVP_PKEY_CTX_set_rsa_pss_keygen_md si converted into a
function and it is now called in legacy_ctrl_to_param.

Fixes #12384

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13099)