[c10s] Fixes for the new s390x "boot order" feature

Thomas Huthrequested to merge
thuth/qemu-kvm-cs:RHEL-68444 into c10s

JIRA: https://issues.redhat.com/browse/RHEL-68444

Fix certain boot scenarios that were not working yet with the new "boot order" feature.

Signed-off-by: Thomas Huth thuth@redhat.com

Resolves: RHEL-68444

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