16ach6h: Do not duplicate nvidia config

lenovo/legion/16ach6h/default.nix

@@ -5,14 +5,6 @@
 
   specialisation.ddg.configuration = {
     # This specialisation is for the case where "DDG" (Dual-Direct GFX, A hardware feature that can enable in bios) is enabled, since the amd igpu is blocked at hardware level and the built-in display is directly connected to the dgpu, we no longer need the amdgpu and prime configuration.
-    system.nixos.tags = [ "Dual-Direct-GFX-Mode" ];
-    services.xserver.videoDrivers = [ "nvidia" ]; # This will override services.xserver.videoDrivers = lib.mkDefault [ "amdgpu" "nvidia" ];
-    hardware = {
-      nvidia.prime.offload.enable = false;
-      amdgpu = {
-        amdvlk = false;
-        opencl = false;
-      };
-    };
+    imports = [ ./nvidia.nix ];
   };
-}
+}