nixos/xpadneo: init at 0.8.1

I just got an Xbox One controller and I wasn't satisfied with the xpad
driver that ships with the Linux kernel

xpadneo supports more features and fixes problems with
incorrect button mappings

https://atar-axis.github.io/xpadneo

nixos/modules/module-list.nix

@@ -76,6 +76,7 @@
   ./hardware/video/nvidia.nix
   ./hardware/video/uvcvideo/default.nix
   ./hardware/video/webcam/facetimehd.nix
+  ./hardware/xpadneo.nix
   ./i18n/input-method/default.nix
   ./i18n/input-method/fcitx.nix
   ./i18n/input-method/ibus.nix