Attempt to boot RHEL AI 1.5-6 on a Grace Hopper device fails to dracut emergency shell on fail of OSTree Prepare OS/ service.

The related issue: https://issues.redhat.com/browse/RHEL-63985 

( blkszbits 12 isn't supported on this platform.)

Relevant threads: 

https://redhat-internal.slack.com/archives/C02CU30L7GF/p1747077051165759

https://redhat-internal.slack.com/archives/C07EPDKLJMD/p1747075753449519