uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/modules/hardware/nitrokey.nix

@@ -0,0 +1,27 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.hardware.nitrokey;
+
+in
+
+{
+  options.hardware.nitrokey = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Enables udev rules for Nitrokey devices. By default grants access
+        to users in the "nitrokey" group. You may want to install the
+        nitrokey-app package, depending on your device and needs.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.udev.packages = [ pkgs.nitrokey-udev-rules ];
+  };
+}