s390/ipl: Fix boot order
The latest ipl code adaptions collided with some of the virtio refactoring rework. This resulted in always booting the first disk. Let's fix booting from a given ID. The new code also checks for command lines without bootindex to avoid random behaviour when accessing dev_st (==0). Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: NAndreas Färber <afaerber@suse.de> Signed-off-by: NAlexander Graf <agraf@suse.de>
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