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/irqbalance.nix

@@ -0,0 +1,24 @@
+#
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.irqbalance;
+
+in
+{
+  options.services.irqbalance.enable = mkEnableOption "irqbalance daemon";
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ pkgs.irqbalance ];
+
+    systemd.services.irqbalance.wantedBy = ["multi-user.target"];
+
+    systemd.packages = [ pkgs.irqbalance ];
+
+  };
+
+}