firstboot: Use new setup mechanism
firstboot: Use new setup mechanism

kkampardi/Plinth,kkampardi/Plinth,vignanl/Plinth,vignanl/Plinth,harry-7/Plinth,freedomboxtwh/Plinth,freedomboxtwh/Plinth,freedomboxtwh/Plinth,vignanl/Plinth,harry-7/Plinth,kkampardi/Plinth,freedomboxtwh/Plinth,harry-7/Plinth,vignanl/Plinth,freedomboxtwh/Plinth,vignanl/Plinth,harry-7/Plinth,kkampardi/Plinth,kkampardi/Plinth,harry-7/Plinth