refactor(dev-mngr): store vm as Arc in MMIODevManagerConstructorArgs#5401

ShadowCurse merged 2 commits intofirecracker-microvm:mainfirecracker-microvm/firecracker:mainfrom

Manciukic:refactor/arc-vm-in-mmio-dev-mgrManciukic/firecracker:refactor/arc-vm-in-mmio-dev-mgrCopy head branch name to clipboard