fn remove_hotplug_bridge<V: VmArch, Vcpu: VcpuArch>(
    linux: &RunnableLinuxVm<V, Vcpu>,
    sys_allocator: &mut SystemAllocator,
    hp_control_tube: &Sender<PciRootCommand>,
    buses_to_remove: &mut Vec<u8>,
    host_key: HostHotPlugKey,
    child_bus: u8
) -> Result<()>