eap_proxy: Fix eap_proxy_init() prototype to use const eapol_cb

The eapol_cb structure was made const and that change resulted in a
compilation warning/error if CONFIG_EAP_PROXY=<name> is enabled in the
wpa_supplicant build configuration. Fix this by updating the function
prototype to match the change.

Note: This results in a change needed to external eap_proxy_*.c
implementations to match the change.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/eap_peer/eap_proxy.h

@@ -20,7 +20,7 @@ enum eap_proxy_status {
 };
 
 struct eap_proxy_sm *
-eap_proxy_init(void *eapol_ctx, struct eapol_callbacks *eapol_cb,
+eap_proxy_init(void *eapol_ctx, const struct eapol_callbacks *eapol_cb,
 	       void *msg_ctx);
 
 void eap_proxy_deinit(struct eap_proxy_sm *eap_proxy);

src/eap_peer/eap_proxy_dummy.c

@@ -12,7 +12,7 @@
 #include "eap_proxy.h"
 
 struct eap_proxy_sm *
-eap_proxy_init(void *eapol_ctx, struct eapol_callbacks *eapol_cb,
+eap_proxy_init(void *eapol_ctx, const struct eapol_callbacks *eapol_cb,
 	       void *msg_ctx)
 {
 	return NULL;