Add RSA public key (in an X.509v3 certificate) and private key for IMSI
privacy. These were generated with
openssl req -new -x509 -sha256 -newkey rsa:2048 -nodes -days 7500 \
-keyout imsi-privacy-key.pem -out imsi-privacy-cert.pem
Test the case where wpa_supplicant side RSA-OAEP operation for IMSI
privacy is done in an external component while the hostapd (EAP server)
processing of the encrypted identity is internal.
Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>