Add missing FDC init to the Silicon Valley Computer 486WB

src/machine/m_at_socket1.c

@@ -115,6 +115,9 @@ machine_at_svc486wb_init(const machine_t *model)
     device_add_params(machine_get_kbc_device(machine), (void *) model->kbc_params);
     device_add(&ide_isa_device);
 
+    if (fdc_current[0] == FDC_INTERNAL)
+        device_add(&fdc_at_device);
+
     return ret;
 }