Remove udisks module

It's no longer used in NixOS.

nixos/modules/module-list.nix

@@ -121,7 +121,6 @@
   ./services/hardware/pommed.nix
   ./services/hardware/sane.nix
   ./services/hardware/udev.nix
-  ./services/hardware/udisks.nix
   ./services/hardware/udisks2.nix
   ./services/hardware/upower.nix
   ./services/hardware/thinkfan.nix

nixos/modules/services/hardware/udisks.nix

@@ -1,45 +0,0 @@
-# Udisks daemon.
-
-{ config, lib, pkgs, ... }:
-
-with lib;
-
-{
-
-  ###### interface
-
-  options = {
-
-    services.udisks = {
-
-      enable = mkOption {
-        type = types.bool;
-        default = false;
-        description = ''
-          Whether to enable Udisks, a DBus service that allows
-          applications to query and manipulate storage devices.
-        '';
-      };
-
-    };
-
-  };
-
-
-  ###### implementation
-
-  config = mkIf config.services.udisks.enable {
-
-    environment.systemPackages = [ pkgs.udisks ];
-
-    services.dbus.packages = [ pkgs.udisks ];
-
-    system.activationScripts.udisks =
-      ''
-        mkdir -m 0755 -p /var/lib/udisks
-      '';
-
-    services.udev.packages = [ pkgs.udisks ];
-  };
-
-}