Add a starting point for EAP-AKA' (draft-arkko-eap-aka-kdf-10)

This is just making an as-is copy of EAP-AKA server and peer
implementation into a new file and by using the different EAP method
type that is allocated for EAP-AKA' (50). None of the other differences
between EAP-AKA and EAP-AKA' are not yet included.

It is likely that once EAP-AKA' implementation is done and is found to
work correctly, large part of the EAP-AKA and EAP-AKA' code will be
shared. However, it is not reasonable to destabilize EAP-AKA
implementation at this point before it is clearer what the final
differences will be.

src/eap_server/eap_methods.c

@@ -212,6 +212,13 @@ int eap_server_register_methods(void)
 	}
 #endif /* EAP_AKA */
 
+#ifdef EAP_AKA_PRIME
+	if (ret == 0) {
+		int eap_server_aka_prime_register(void);
+		ret = eap_server_aka_prime_register();
+	}
+#endif /* EAP_AKA_PRIME */
+
 #ifdef EAP_PAX
 	if (ret == 0) {
 		int eap_server_pax_register(void);