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/iotools/default.nix

@@ -0,0 +1,35 @@
+{ stdenv, lib, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "iotools";
+  version = "unstable-2017-12-11";
+
+  src = fetchFromGitHub {
+    owner = "adurbin";
+    repo = pname;
+    rev = "18949fdc4dedb1da3f51ee83a582b112fb9f2c71";
+    sha256 = "0vymnah44d5bzsjhfmxkcrlrikkp0db22k7a1s8bknz7glk9fldn";
+  };
+
+  makeFlags = [ "DEBUG=0" "STATIC=0" ];
+
+  installPhase = ''
+    install -Dm755 iotools -t $out/bin
+  '';
+
+  meta = with lib; {
+    description = "Set of simple command line tools which allow access to
+      hardware device registers";
+    longDescription = ''
+      Provides a set of simple command line tools which allow access to
+      hardware device registers. Supported register interfaces include PCI,
+      IO, memory mapped IO, SMBus, CPUID, and MSR. Also included are some
+      utilities which allow for simple arithmetic, logical, and other
+      operations.
+    '';
+    homepage = "https://github.com/adurbin/iotools";
+    license = licenses.gpl2Only;
+    maintainers = with maintainers; [ felixsinger ];
+    platforms = [ "x86_64-linux" "i686-linux" ];
+  };
+}