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/hardware/pommed.nix

@@ -0,0 +1,50 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.hardware.pommed;
+    defaultConf = "${pkgs.pommed_light}/etc/pommed.conf.mactel";
+in {
+
+  options = {
+
+    services.hardware.pommed = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to use the pommed tool to handle Apple laptop
+          keyboard hotkeys.
+        '';
+      };
+
+      configFile = mkOption {
+        type = types.nullOr types.path;
+        default = null;
+        description = ''
+          The path to the <filename>pommed.conf</filename> file. Leave
+          to null to use the default config file
+          (<filename>/etc/pommed.conf.mactel</filename>). See the
+          files <filename>/etc/pommed.conf.mactel</filename> and
+          <filename>/etc/pommed.conf.pmac</filename> for examples to
+          build on.
+        '';
+      };
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.polkit pkgs.pommed_light ];
+
+    environment.etc."pommed.conf".source =
+      if cfg.configFile == null then defaultConf else cfg.configFile;
+
+    systemd.services.pommed = {
+      description = "Pommed Apple Hotkeys Daemon";
+      wantedBy = [ "multi-user.target" ];
+      script = "${pkgs.pommed_light}/bin/pommed -f";
+    };
+  };
+}