Do not configure Altera PIO device on ARM startup.

PIO is a device implemented in soft-core and becomes
available after flashing FPGA only.

sys/dev/altera/pio/pio.c

@@ -178,8 +178,6 @@ pio_attach(device_t dev)
 	sc->bst = rman_get_bustag(sc->res[0]);
 	sc->bsh = rman_get_bushandle(sc->res[0]);
 
-	WRITE4(sc, PIO_DATA, 0);
-
 	if ((node = ofw_bus_get_node(sc->dev)) == -1)
 		return (ENXIO);
 

sys/dev/beri/virtio/virtio.c

@@ -211,8 +211,6 @@ setup_pio(device_t dev, char *name, device_t *pio_dev)
 	SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) {
 		if (ic->iph == pio_node) {
 			*pio_dev = ic->dev;
-			PIO_CONFIGURE(*pio_dev, PIO_OUT_ALL,
-					PIO_UNMASK_ALL);
 			return (0);
 		}
 	}