Test for and use AES CSP for RSA if present.
Test for and use AES CSP for RSA if present.

Some keys are attached to the full RSA CSP which doesn't support SHA2
algorithms: uses the AES CSP if present.

Reviewed-by: Tim Hudson <eb0be8e447f673b41b10eda09d63cd72526b0a42@openssl.org>

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