EVP: For SIGNATURE operations, pass the propquery early

EVP: For SIGNATURE operations, pass the propquery early

Instead of passing it with signature->digest_verify_init() and
signature->digest_sign_init(), we pass it with signature->newctx().
This allows the digests that are indicated by RSA PSS parameters
to have a useful propquery.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11710)