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/programs/kbdlight.nix

@@ -0,0 +1,21 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.kbdlight;
+
+in
+{
+  options.programs.kbdlight.enable = mkEnableOption "kbdlight";
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.kbdlight ];
+    security.wrappers.kbdlight =
+      { setuid = true;
+        owner = "root";
+        group = "root";
+        source = "${pkgs.kbdlight.out}/bin/kbdlight";
+      };
+  };
+}