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>

nixos/modules/misc/meta.nix

@@ -0,0 +1,76 @@
+{ lib, ... }:
+
+with lib;
+
+let
+  maintainer = mkOptionType {
+    name = "maintainer";
+    check = email: elem email (attrValues lib.maintainers);
+    merge = loc: defs: listToAttrs (singleton (nameValuePair (last defs).file (last defs).value));
+  };
+
+  listOfMaintainers = types.listOf maintainer // {
+    # Returns list of
+    #   { "module-file" = [
+    #        "maintainer1 <first@nixos.org>"
+    #        "maintainer2 <second@nixos.org>" ];
+    #   }
+    merge = loc: defs:
+      zipAttrs
+        (flatten (imap1 (n: def: imap1 (m: def':
+          maintainer.merge (loc ++ ["[${toString n}-${toString m}]"])
+            [{ inherit (def) file; value = def'; }]) def.value) defs));
+  };
+
+  docFile = types.path // {
+    # Returns tuples of
+    #   { file = "module location"; value = <path/to/doc.xml>; }
+    merge = loc: defs: defs;
+  };
+in
+
+{
+  options = {
+    meta = {
+
+      maintainers = mkOption {
+        type = listOfMaintainers;
+        internal = true;
+        default = [];
+        example = literalExpression ''[ lib.maintainers.all ]'';
+        description = ''
+          List of maintainers of each module.  This option should be defined at
+          most once per module.
+        '';
+      };
+
+      doc = mkOption {
+        type = docFile;
+        internal = true;
+        example = "./meta.chapter.xml";
+        description = ''
+          Documentation prologue for the set of options of each module.  This
+          option should be defined at most once per module.
+        '';
+      };
+
+      buildDocsInSandbox = mkOption {
+        type = types.bool // {
+          merge = loc: defs: defs;
+        };
+        internal = true;
+        default = true;
+        description = ''
+          Whether to include this module in the split options doc build.
+          Disable if the module references `config`, `pkgs` or other module
+          arguments that cannot be evaluated as constants.
+
+          This option should be defined at most once per module.
+        '';
+      };
+
+    };
+  };
+
+  meta.maintainers = singleton lib.maintainers.pierron;
+}