refactor: use nixos-hardware GPU configs

Replace custom GPU config with ones from nixos-hardware.

hardware/gpu-amd.nix

@@ -1,14 +0,0 @@
-{ pkgs, ... }:
-
-{
-  boot.initrd.kernelModules = [ "amdgpu" ];
-
-  hardware.opengl = {
-    driSupport = true;
-    driSupport32Bit = true;
-    extraPackages = with pkgs; [ libvdpau-va-gl vaapiVdpau ];
-    extraPackages32 = with pkgs.driversi686Linux; [ libvdpau-va-gl vaapiVdpau ];
-  };
-
-  environment.systemPackages = with pkgs; [ glxinfo vulkan-tools ];
-}

hardware/gpu-intel.nix

@@ -1,27 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-{
-  boot.initrd.kernelModules = [ "i915" ];
-
-  # kaby lake
-  boot.kernelParams = [ "i915.enable_guc=3" ];
-
-  environment.variables = {
-    VDPAU_DRIVER =
-      lib.mkIf config.hardware.opengl.enable (lib.mkDefault "va_gl");
-  };
-
-  hardware.opengl = {
-    extraPackages = with pkgs; [
-      intel-vaapi-driver
-      intel-media-driver
-      intel-compute-runtime
-      libvdpau-va-gl
-    ];
-    extraPackages32 = with pkgs.driversi686Linux; [
-      intel-vaapi-driver
-      intel-media-driver
-      libvdpau-va-gl
-    ];
-  };
-}

hardware/lattepanda.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, modulesPath, ... }:
+{ config, lib, ... }:
 
 {
   boot.initrd.availableKernelModules = [
@@ -13,6 +13,7 @@
   ];
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ "kvm-intel" ];
+  boot.kernelParams = [ "i915.enable_guc=3" ];
   boot.extraModulePackages = [ ];
 
   fileSystems."/" = {