gate ethernet behind soc support

network.h

@@ -2,6 +2,7 @@
 #define NETWORK_H
 
 #include <esp_event.h>
+#include <soc/soc_caps.h>
 
 #define POSIX_TIMEZONE_STRING "CET-1CEST,M3.5.0,M10.5.0/3"
 #define SNTP_TIME_SYNC_INTERVAL_MINUTES (6 * 60) // 6 hours
@@ -26,6 +27,9 @@ struct wifi_networks_t {
 };
 
 void init_wifi(const struct wifi_networks_t *nets, const char *hostname);
+
+#if SOC_EMAC_SUPPORTED
 void init_ethernet(const char *hostname);
+#endif
 
 #endif