feat(hosts/orion): enable iwlwifi power save

We setup a custom `steam.desktop` entry for our applications that makes
Steam run on the Nvidia graphics card. As a consequence, all processes
launched by steam will likewise offload their graphical rendering to the
discrete graphics card as well.

hosts/orion/modules/hardware.nix

@@ -1,4 +1,9 @@
-{ pkgs, config, ... }:
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
 {
   services.xserver.videoDrivers = [ "nvidia" ];
   environment.variables.VDPAU_DRIVER = "va_gl";
@@ -16,6 +21,7 @@
       extraPackages32 = with pkgs.driversi686Linux; [ intel-vaapi-driver ];
     };
     nvidia = {
+      nvidiaSettings = true;
       package = config.boot.kernelPackages.nvidiaPackages.beta;
       powerManagement.enable = true;
       prime = {