P2P: Do not enable P2P group processing for non-P2P AP mode

wpa_supplicant was starting P2P group processing for all AP mode
interfaces in CONFIG_P2P=y builds. This is unnecessary and such
operations should be enabled only for actual GO interfaces.

Signed-off-by: Jouni Malinen <j@w1.fi>

wpa_supplicant/p2p_supplicant.c

@@ -6318,7 +6318,8 @@ struct p2p_group * wpas_p2p_group_init(struct wpa_supplicant *wpa_s,
 	struct p2p_group *group;
 	struct p2p_group_config *cfg;
 
-	if (wpa_s->global->p2p_disabled || wpa_s->global->p2p == NULL)
+	if (wpa_s->global->p2p_disabled || wpa_s->global->p2p == NULL ||
+	    !ssid->p2p_group)
 		return NULL;
 
 	cfg = os_zalloc(sizeof(*cfg));