pc-bios/s390-ccw.img: update image

Contains the following commits:

- pc-bios/s390-ccw: Make ebcdic/ascii conversion public
- pc-bios/s390-ccw: get LOADPARM stored in SCP Read Info
- pc-bios/s390-ccw: provide a function to interpret LOADPARM value
- pc-bios/s390-ccw: provide entry selection on LOADPARM for SCSI disk
- pc-bios/s390-ccw: add boot entry selection for ECKD DASD
- pc-bios/s390-ccw: add boot entry selection to El Torito routine

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