qdev:pci: refactor PCIDevice to use generic "hotpluggable" property

Get rid of PCIDevice specific PCIDeviceClass.no_hotplug and use
generic DeviceClass.hotpluggable field instead.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index 0f45e11..077776a 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -536,7 +536,6 @@
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
-    k->no_hotplug = 1;
     k->init = piix4_pm_initfn;
     k->config_write = pm_write_config;
     k->vendor_id = PCI_VENDOR_ID_INTEL;
@@ -551,6 +550,7 @@
      * e.g. by mips_malta_init()
      */
     dc->cannot_instantiate_with_device_add_yet = true;
+    dc->hotpluggable = false;
 }
 
 static const TypeInfo piix4_pm_info = {