fix(nimble): Address compilation issues in nimble examples

examples/bluetooth/ble_get_started/nimble/NimBLE_Connection/main/main.c

@@ -82,12 +82,14 @@ void app_main(void) {
         return;
     }
 
+#if CONFIG_BT_NIMBLE_GAP_SERVICE
     /* GAP service initialization */
     rc = gap_init();
     if (rc != 0) {
         ESP_LOGE(TAG, "failed to initialize GAP service, error code: %d", rc);
         return;
     }
+#endif
 
     /* NimBLE host configuration initialization */
     nimble_host_config_init();

examples/bluetooth/ble_get_started/nimble/NimBLE_Connection/main/src/gap.c

@@ -251,6 +251,7 @@ int gap_init(void) {
     /* Local variables */
     int rc = 0;
 
+
     /* Initialize GAP service */
     ble_svc_gap_init();