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-reloadable.nix

@@ -0,0 +1,71 @@
+import ./make-test-python.nix ({ pkgs, lib, ... }:
+let
+  client_base = {
+    containers.test1 = {
+      autoStart = true;
+      config = {
+        environment.etc.check.text = "client_base";
+      };
+    };
+
+    # prevent make-test-python.nix to change IP
+    networking.interfaces = {
+      eth1.ipv4.addresses = lib.mkOverride 0 [ ];
+    };
+  };
+in {
+  name = "containers-reloadable";
+  meta = {
+    maintainers = with lib.maintainers; [ danbst ];
+  };
+
+  nodes = {
+    client = { ... }: {
+      imports = [ client_base ];
+    };
+
+    client_c1 = { lib, ... }: {
+      imports = [ client_base ];
+
+      containers.test1.config = {
+        environment.etc.check.text = lib.mkForce "client_c1";
+        services.httpd.enable = true;
+        services.httpd.adminAddr = "nixos@example.com";
+      };
+    };
+    client_c2 = { lib, ... }: {
+      imports = [ client_base ];
+
+      containers.test1.config = {
+        environment.etc.check.text = lib.mkForce "client_c2";
+        services.nginx.enable = true;
+      };
+    };
+  };
+
+  testScript = {nodes, ...}: let
+    c1System = nodes.client_c1.config.system.build.toplevel;
+    c2System = nodes.client_c2.config.system.build.toplevel;
+  in ''
+    client.start()
+    client.wait_for_unit("default.target")
+
+    assert "client_base" in client.succeed("nixos-container run test1 cat /etc/check")
+
+    with subtest("httpd is available after activating config1"):
+        client.succeed(
+            "${c1System}/bin/switch-to-configuration test >&2",
+            "[[ $(nixos-container run test1 cat /etc/check) == client_c1 ]] >&2",
+            "systemctl status httpd -M test1 >&2",
+        )
+
+    with subtest("httpd is not available any longer after switching to config2"):
+        client.succeed(
+            "${c2System}/bin/switch-to-configuration test >&2",
+            "[[ $(nixos-container run test1 cat /etc/check) == client_c2 ]] >&2",
+            "systemctl status nginx -M test1 >&2",
+        )
+        client.fail("systemctl status httpd -M test1 >&2")
+  '';
+
+})