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/haka.nix

@@ -0,0 +1,24 @@
+# This test runs haka and probes it with hakactl
+
+import ./make-test-python.nix ({ pkgs, ...} : {
+  name = "haka";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ tvestelind ];
+  };
+
+  nodes = {
+    haka =
+      { ... }:
+        {
+          services.haka.enable = true;
+        };
+    };
+
+  testScript = ''
+    start_all()
+
+    haka.wait_for_unit("haka.service")
+    haka.succeed("hakactl status")
+    haka.succeed("hakactl stop")
+  '';
+})