This allows users to simply enable support for all hardware by enabling the option `hardware.enableAllHardware`, instead of having to import `modules/profiles/all-hardware.nix`.
This is better, as the enableAllHardware option will be discoverable via search.nixos.org, while the `all-hardware.nix` is hidden inside nixpkgs and hard to discover.
Backward compatibility is provided by replacing the old `profiles/all-hardware.nix` with a file that sets the `enableAllHardware` option to true.
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