release-tools: Remove usage of removed option
Recent changes in Nixpkgs makes it more strict.
This is a change that wasn't caught as needed from the migration to
structured options for device infos.
config = lib.mkMerge [
config
{
- mobile.device.info = {};
mobile.system.type = "none";
mobile.hardware.soc = {
x86_64-linux = "generic-x86_64";
