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/ndppd.nix

@@ -0,0 +1,60 @@
+import ./make-test-python.nix ({ pkgs, lib, ...} : {
+  name = "ndppd";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ fpletz ];
+  };
+
+  nodes = {
+    upstream = { pkgs, ... }: {
+      environment.systemPackages = [ pkgs.tcpdump ];
+      networking.useDHCP = false;
+      networking.interfaces = {
+        eth1 = {
+          ipv6.addresses = [
+            { address = "fd23::1"; prefixLength = 112; }
+          ];
+          ipv6.routes = [
+            { address = "fd42::";
+              prefixLength = 112;
+            }
+          ];
+        };
+      };
+    };
+    server = { pkgs, ... }: {
+      boot.kernel.sysctl = {
+        "net.ipv6.conf.all.forwarding" = "1";
+        "net.ipv6.conf.default.forwarding" = "1";
+      };
+      environment.systemPackages = [ pkgs.tcpdump ];
+      networking.useDHCP = false;
+      networking.interfaces = {
+        eth1 = {
+          ipv6.addresses = [
+            { address = "fd23::2"; prefixLength = 112; }
+          ];
+        };
+      };
+      services.ndppd = {
+        enable = true;
+        proxies.eth1.rules."fd42::/112" = {};
+      };
+      containers.client = {
+        autoStart = true;
+        privateNetwork = true;
+        hostAddress = "192.168.255.1";
+        localAddress = "192.168.255.2";
+        hostAddress6 = "fd42::1";
+        localAddress6 = "fd42::2";
+        config = {};
+      };
+    };
+  };
+
+  testScript = ''
+    start_all()
+    server.wait_for_unit("multi-user.target")
+    upstream.wait_for_unit("multi-user.target")
+    upstream.wait_until_succeeds("ping -c5 fd42::2")
+  '';
+})