Add limine.biosDevice to match grub.devices

[JimmJam]

When you add a disk with Disko, and enable the Grub bootloader, the main disk's disko.devices.disk.<name>.device is added to the list of grub.devices, but not limine.biosDevice.

It would be nice to see limine get first class support in Disko :)

[Mic92]

Does liminie not support multiple devices btw? What happens if you have a raid?

[JimmJam]

I believe Limine's biosDevice setting only points limine to the device it's suppose to do the uefi bios partition/bios bootup to, and doesn't support multiple devices. In Nix it's set to a string and not a set of strings, so I think this would only be for a one device "boot partition" setup.