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/os-specific/linux/turbostat/default.nix

@@ -0,0 +1,21 @@
+{ lib, stdenv, kernel, libcap }:
+
+stdenv.mkDerivation {
+  pname = "turbostat";
+  inherit (kernel) src version;
+
+  buildInputs = [ libcap ];
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
+
+  postPatch = ''
+    cd tools/power/x86/turbostat
+  '';
+
+  meta = with lib; {
+    description = "Report processor frequency and idle statistics";
+    homepage = "https://www.kernel.org/";
+    license = licenses.gpl2;
+    platforms = [ "i686-linux" "x86_64-linux" ]; # x86-specific
+  };
+}
+