engines/e_capi.c: slip in PROV_RSA_AES for interchangable CSP only.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3034)

(cherry picked from commit 8ab9af5e)