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/containers-custom-pkgs.nix

@@ -0,0 +1,34 @@
+import ./make-test-python.nix ({ pkgs, lib, ... }: let
+
+  customPkgs = pkgs.appendOverlays [ (self: super: {
+    hello = super.hello.overrideAttrs (old: {
+       name = "custom-hello";
+    });
+  }) ];
+
+in {
+  name = "containers-custom-pkgs";
+  meta = {
+    maintainers = with lib.maintainers; [ adisbladis earvstedt ];
+  };
+
+  nodes.machine = { config, ... }: {
+    assertions = let
+      helloName = (builtins.head config.containers.test.config.system.extraDependencies).name;
+    in [ {
+      assertion = helloName == "custom-hello";
+      message = "Unexpected value: ${helloName}";
+    } ];
+
+    containers.test = {
+      autoStart = true;
+      config = { pkgs, config, ... }: {
+        nixpkgs.pkgs = customPkgs;
+        system.extraDependencies = [ pkgs.hello ];
+      };
+    };
+  };
+
+  # This test only consists of evaluating the test machine
+  testScript = "pass";
+})