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>

pkgs/tools/misc/pk2cmd/default.nix

@@ -0,0 +1,28 @@
+{lib, stdenv, fetchurl, libusb-compat-0_1, makeWrapper}:
+
+stdenv.mkDerivation rec {
+  pname = "pk2cmd";
+  version = "1.20";
+  src = fetchurl {
+    url = "https://ww1.microchip.com/downloads/en/DeviceDoc/pk2cmdv${version}LinuxMacSource.tar.gz";
+    sha256 = "1yjpi2qshnqfpan4w3ggakkr3znfrx5cxkny92ka7v9na3g2fc4h";
+  };
+
+  makeFlags = [ "LIBUSB=${libusb-compat-0_1.dev}" "linux" ];
+
+  installPhase = ''
+    mkdir -p $out/bin $out/share/pk2
+    cp pk2cmd $out/bin
+    cp PK2DeviceFile.dat $out/share/pk2
+    wrapProgram $out/bin/pk2cmd --prefix PATH : $out/share/pk2
+  '';
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ libusb-compat-0_1 ];
+
+  meta = {
+    homepage = "https://www.microchip.com/pickit2";
+    license = lib.licenses.unfree; #MicroChip-PK2
+    description = "Microchip PIC programming software for the PICKit2 programmer";
+  };
+}