add virtio-console initializer for x86 (Christian Ehrhardt)

This adds an intialization of virtio console for pc style hardware.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6318 c046a42c-6fe2-441c-8c8c-71466251a162
