Trigger emergency shutdown on resume when the boot device is missing
Type of work:
i.e. it was removed during suspend. The idea is that when suspended, both sequences of user actions should result in emergency shutdown:
- wake up the system, then unplug the boot device: this works
- unplug the boot device, then wake up the system: this used to work but the fix for #11729 broke it as a side effect
See #11052#note-31 and follow-ups.