Merge branch 'bugfix/support_eth_intf_only' into 'master'

fix: Supported to use ethernet interface only mode

See merge request application/esp-at!1643

components/at/src/at_init.c

@@ -62,7 +62,7 @@ static void at_wifi_statistics_task(void *params)
 
 esp_err_t esp_at_netif_init(void)
 {
-#ifdef CONFIG_AT_WIFI_COMMAND_SUPPORT
+#if defined(CONFIG_AT_WIFI_COMMAND_SUPPORT) || defined(CONFIG_AT_ETHERNET_SUPPORT)
     return esp_netif_init();
 #else
     return ESP_OK;