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>

lib/source-types.nix

@@ -0,0 +1,19 @@
+{ lib }:
+
+let
+  defaultSourceType = tname: {
+    shortName = tname;
+    isSource = false;
+  };
+in lib.mapAttrs (tname: tset: defaultSourceType tname // tset) {
+
+  fromSource = {
+    isSource = true;
+  };
+
+  binaryNativeCode = {};
+
+  binaryBytecode = {};
+
+  binaryFirmware = {};
+}