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/tests/packagekit.nix

@@ -0,0 +1,25 @@
+import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "packagekit";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ peterhoeg ];
+  };
+
+  nodes.machine = { ... }: {
+    environment.systemPackages = with pkgs; [ dbus ];
+    services.packagekit = {
+      enable = true;
+    };
+  };
+
+  testScript = ''
+    start_all()
+
+    # send a dbus message to activate the service
+    machine.succeed(
+        "dbus-send --system --type=method_call --print-reply --dest=org.freedesktop.PackageKit /org/freedesktop/PackageKit org.freedesktop.DBus.Introspectable.Introspect"
+    )
+
+    # so now it should be running
+    machine.wait_for_unit("packagekit.service")
+  '';
+})