refactor(system): flatten

inputs/system/modules/base/host/hardware/gpu/amd.nix

@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+let
+  gpu = config.systemModules.host.hardware.gpu;
+  inherit (lib) mkIf mkDefault;
+  inherit (builtins) elem;
+in
+
+{
+  config = mkIf (elem gpu.type ["amd"]) {
+    hardware.opengl = {
+      extraPackages = with pkgs; [
+        vulkan-tools
+        vulkan-loader
+        vulkan-extension-layer
+        vulkan-validation-layers
+        # amdvlk
+        mesa
+      ];
+      extraPackages32 = [ pkgs.driversi686Linux.amdvlk ];
+    };
+    boot = {
+      initrd.kernelModules = ["amdgpu"];
+      kernelModules = ["amdgpu"];
+    };
+    environment.systemPackages = [ pkgs.nvtopPackages.amd ];
+    services.xserver.videoDrivers = mkDefault ["modesetting" "amdgpu"];
+  };
+}