Add patches verilog-ethernet version

This removes a non-existing parameter from an ddr primitive
instantiation.
See alexforencich/verilog-ethernet#214

nix/verilog-ethernet.nix

@@ -2,13 +2,25 @@
 
 pkgs.stdenv.mkDerivation rec {
   name = "verilog-ethernet";
+  src = verilog-ethernet-patches;
 
-  src = pkgs.fetchgit {
+  verilog-ethernet-src = pkgs.fetchgit {
     url = "https://github.com/alexforencich/verilog-ethernet.git";
     rev = "baac5f8d811d43853d59d69957975ead8bbed088";
     sha256 = "sha256-rxoUHjOxxQc/JjEp06vibCJ2OIWbsbEtnkqS1gS+A7g=";
   };
 
+  verilog-ethernet-patches = pkgs.applyPatches {
+    name = "verilog-ethernet-patched";
+    src = verilog-ethernet-src;
+    patches = [
+      (pkgs.fetchpatch {
+        url = "https://github.com/lmbollen/verilog-ethernet/commit/f762edd71dfebc129dacac64ff5cd5fbf7d67801.patch";
+        hash = "sha256-hKHsNViPInDKzOP3OwMZFlQ0RjYYTFPRu6rOJF1g0hQ=";
+      })
+    ];
+  };
+
   installPhase = ''
     mkdir -p $out
     mv * $out