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/x86_energy_perf_policy/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, kernel }:
+
+stdenv.mkDerivation {
+  pname = "x86_energy_perf_policy";
+  version = kernel.version;
+
+  src = kernel.src;
+
+  postPatch = ''
+    cd tools/power/x86/x86_energy_perf_policy
+    sed -i 's,/usr,,g' Makefile
+  '';
+
+  preInstall = ''
+    mkdir -p $out/bin $out/share/man/man8
+  '';
+
+  makeFlags = [ "DESTDIR=$(out)" ];
+
+  meta = with lib; {
+    description = "Set the energy versus performance policy preference bias on recent X86 processors";
+    homepage = "https://www.kernel.org/";
+    license = licenses.gpl2;
+    platforms = [ "i686-linux" "x86_64-linux" ]; # x86-specific
+  };
+}