qdev: Export qdev_hot_removed

I need to move qdev_unplug to qdev-monitor in the following patch, and
it needs access to this variable.
Signed-off-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com>

hw/core/qdev.c

@@ -41,7 +41,7 @@
 
 bool qdev_hotplug = false;
 static bool qdev_hot_added = false;
-static bool qdev_hot_removed = false;
+bool qdev_hot_removed = false;
 
 const VMStateDescription *qdev_get_vmsd(DeviceState *dev)
 {

include/hw/qdev-core.h

@@ -387,6 +387,7 @@ Object *qdev_get_machine(void);
 void qdev_set_parent_bus(DeviceState *dev, BusState *bus);
 
 extern bool qdev_hotplug;
+extern bool qdev_hot_removed;
 
 char *qdev_get_dev_path(DeviceState *dev);