s390-ccw.img: rebuild image

Contains the following changes:

pc-bios/s390-ccw: add more disk layout checks
pc-bios/s390-ccw: virtio_panic -> panic
pc-bios/s390-ccw: add utility functions and "export" some others
pc-bios/s390-ccw: qemuize types
pc-bios/s390-ccw: update virtio implementation to allow up to 3 vrings
pc-bios/s390-ccw: add vdev object to store all device details
pc-bios/s390-ccw: make provisions for different backends
pc-bios/s390-ccw: add simplified virtio call
pc-bios/s390-ccw: add scsi definitions
pc-bios/s390-ccw: add virtio-scsi implementation
pc-bios/s390-ccw: enable virtio-scsi
pc-bios/s390-ccw: enhance bootmap detection
pc-bios/s390-ccw: disambiguation of "No zIPL magic" message

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>