qdev: Fold state enum into bool realized Whether the device was initialized or not is QOM-level information and currently unused. Drop it from device. This leaves the boolean state of whether or not DeviceClass::init was called or not, a.k.a. "realized". Suggested-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>