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/services/misc/tp-auto-kbbl.nix

@@ -0,0 +1,58 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.tp-auto-kbbl;
+
+in {
+  meta.maintainers = with maintainers; [ sebtm ];
+
+  options = {
+    services.tp-auto-kbbl = {
+      enable = mkEnableOption "Auto toggle keyboard back-lighting on Thinkpads (and maybe other laptops) for Linux";
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.tp-auto-kbbl;
+        defaultText = literalExpression "pkgs.tp-auto-kbbl";
+        description = "Package providing <command>tp-auto-kbbl</command>.";
+      };
+
+      arguments = mkOption {
+        type = types.listOf types.str;
+        default = [ ];
+        description = ''
+          List of arguments appended to <literal>./tp-auto-kbbl --device [device] [arguments]</literal>
+        '';
+      };
+
+      device = mkOption {
+        type = types.str;
+        default = "/dev/input/event0";
+        description = "Device watched for activities.";
+      };
+
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+
+    systemd.services.tp-auto-kbbl = {
+      serviceConfig = {
+        ExecStart = concatStringsSep " "
+          ([ "${cfg.package}/bin/tp-auto-kbbl" "--device ${cfg.device}" ] ++ cfg.arguments);
+        Restart = "always";
+        Type = "simple";
+      };
+
+      unitConfig = {
+        Description = "Auto toggle keyboard backlight";
+        Documentation = "https://github.com/saibotd/tp-auto-kbbl";
+        After = [ "dbus.service" ];
+      };
+
+      wantedBy = [ "multi-user.target" ];
+    };
+  };
+}