fix Error initializing Hard disK Controller in Siemens Nixdorf D824

since this machine has an internal ide controller

src/machine/m_at_386dx_486.c

@@ -400,6 +400,7 @@ machine_at_d824_init(const machine_t *model)
 
     device_add(&keyboard_ps2_device);
     device_add(&fdc37c651_device);
+    device_add(&ide_isa_device);
     
     return ret;
 }