Add config for Dell XPS 15 9520

dell/xps/15-9520/README.wiki

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+= Dell XPS 15 9520 =
+
+== Tested Hardware ==
+
+* CPU: Intel(R) Core(TM) i7-12700H CPU
+* RAM: 32 GB
+* HDD: 1 TiB SSD
+* Screen: 15" 4k (3840✕2160)
+* Graphics: NVIDIA Corporation GA107M [GeForce RTX 3050 Ti Mobile], with Intel Graphics too.
+* Input: Touchscreen and trackpad.
+
+== Notes ==
+
+Also tested with Dell WD19TB Thunderbolt Dock.
+
+== NVIDIA Offload ==
+
+In order to run a program on the NVIDIA gpu, you can use the `nvidia-offload` function, for example:
+```
+nvidia-offload `nix-shell -p glxinfo --run 'glxgears'`
+```
+This is a short bash script that sets the proper environment variables and calls your command.

dell/xps/15-9520/default.nix

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+{ lib, ... }:
+{
+  imports = [
+    ../../../common/cpu/intel
+    ../../../common/pc/laptop
+    ../../../common/pc/laptop/ssd
+  ];
+
+  # This will save you money and possibly your life!
+  services.thermald.enable = lib.mkDefault true;
+  
+  # WiFi speed is slow and crashes by default (https://bugzilla.kernel.org/show_bug.cgi?id=213381)
+  # disable_11ax - required until ax driver support is fixed
+  # power_save - works well on this card
+  boot.extraModprobeConfig = ''
+    options iwlwifi power_save=1 disable_11ax=1
+  '';
+}

dell/xps/15-9520/nvidia/default.nix

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+{ lib, ... }:
+{
+  imports = [
+    ../default.nix
+    ../../../../common/gpu/nvidia/prime.nix
+  ];
+
+  hardware.nvidia.prime = {
+    # Bus ID of the Intel GPU.
+    intelBusId = lib.mkDefault "PCI:0:2:0";
+
+    # Bus ID of the NVIDIA GPU.
+    nvidiaBusId = lib.mkDefault "PCI:1:0:0";
+  };
+}