Recent changes need two functions to VirtioDevice. This just add them
into VirtioDeviceClass.
Signed-off-by: NKONRAD Frederic <fred.konrad@greensocs.com>
Tested-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Message-id: 1365690602-22729-2-git-send-email-fred.konrad@greensocs.com
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>