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/onlykey/default.nix

@@ -0,0 +1,33 @@
+{ config, lib, ... }:
+
+with lib;
+
+{
+
+  ####### interface
+
+  options = {
+
+    hardware.onlykey = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Enable OnlyKey device (https://crp.to/p/) support.
+        '';
+      };
+    };
+
+  };
+
+  ## As per OnlyKey's documentation piece (hhttps://docs.google.com/document/d/1Go_Rs218fKUx-j_JKhddbSVTqY6P0vQO831t2MKCJC8),
+  ## it is important to add udev rule for OnlyKey for it to work on Linux
+
+  ####### implementation
+
+  config = mkIf config.hardware.onlykey.enable {
+    services.udev.extraRules = builtins.readFile ./onlykey.udev;
+  };
+
+
+}