speed: Also measure RSA encrypt/decrypt, not only RSA sign/verify

speed: Also measure RSA encrypt/decrypt, not only RSA sign/verify

While RSA encrypt/decrypt and sign/verify are basically the same mod-expo
operations, the speed of the operation may still differ, due to different
padding, as well as the use of implicit rejection for RSA decrypt.

Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21383)