vmxnet3: add bootindex to qom property

Add a qom property with the same name 'bootindex',
when we remove it form qdev property, things will
continue to work just fine, and we can use qom features
which are not supported by qdev property.
Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Reviewed-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/net/vmxnet3.c

@@ -2177,6 +2177,13 @@ static int vmxnet3_pci_init(PCIDevice *pci_dev)
     return 0;
 }
 
+static void vmxnet3_instance_init(Object *obj)
+{
+    VMXNET3State *s = VMXNET3(obj);
+    device_add_bootindex_property(obj, &s->conf.bootindex,
+                                  "bootindex", "/ethernet-phy@0",
+                                  DEVICE(obj), NULL);
+}
 
 static void vmxnet3_pci_uninit(PCIDevice *pci_dev)
 {
@@ -2524,6 +2531,7 @@ static const TypeInfo vmxnet3_info = {
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(VMXNET3State),
     .class_init    = vmxnet3_class_init,
+    .instance_init = vmxnet3_instance_init,
 };
 
 static void vmxnet3_register_types(void)