Add Thinkpad X13 Gen1 AMD variant

[jalseth]

Description of changes

Add Thinkpad X13 Gen1 variant for AMD CPU, which is the model I own. https://ubuntu.com/certified/202006-27979/20.04%20LTS.

This change moves some of the config files for the Intel variant, but leaves the Flake output lenovo-thinkpad-x13 as-is to avoid breakage.

Things done

• Tested the changes in your own NixOS Configuration
• Tested the changes end-to-end by using your fork of nixos-hardware and
  importing it via <nixos-hardware> or Flake input

[Mic92]

Will this not also include the intel module?

[Mic92]

The old module could be by using assertions:

nixos-hardware/framework/default.nix

Line 5 in 59e3701

message = "Importing framework/ (default.nix) directly is deprecated! See https://github.com/NixOS/nixos-hardware/blob/master/framework/OLD-BEHAVIOUR-DEPRECATION.md for more details.";

[jalseth]

I don't think so? The imports = [ ../../../common/cpu/intel ] line was deleted from ../default.nix.

Thanks for the tip, I've added an assertion to help clarify this for future users.

[Mic92]

@mergify queue

[mergify]

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