pxa2xx_pic: Set base address for sysbus device.

Thid device's registration was broken since
e1f8c729fa, this should fix it.

hw/pxa2xx_pic.c

@@ -268,6 +268,8 @@ DeviceState *pxa2xx_pic_init(target_phys_addr_t base, CPUState *env)
 
     qdev_init_gpio_in(dev, pxa2xx_pic_set_irq, PXA2XX_PIC_SRCS);
 
+    sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
+
     /* Enable IC memory-mapped registers access.  */
     iomemtype = cpu_register_io_memory(pxa2xx_pic_readfn,
                     pxa2xx_pic_writefn, s, DEVICE_NATIVE_ENDIAN);