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/simple.nix

@@ -0,0 +1,17 @@
+import ./make-test-python.nix ({ pkgs, ...} : {
+  name = "simple";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ eelco ];
+  };
+
+  nodes.machine = { ... }: {
+    imports = [ ../modules/profiles/minimal.nix ];
+  };
+
+  testScript =
+    ''
+      start_all()
+      machine.wait_for_unit("multi-user.target")
+      machine.shutdown()
+    '';
+})