nixos/upower: drop custom unit

All of these changes ++ are in the upstream unit
Also drop glib in path of unit as I don't believe
this should be needed anymore.

nixos/modules/services/hardware/upower.nix

@@ -5,8 +5,11 @@
 with lib;
 
 let
+
   cfg = config.services.upower;
+
 in
+
 {
 
   ###### interface
@@ -49,41 +52,7 @@ in
 
     services.udev.packages = [ cfg.package ];
 
-    systemd.services.upower =
+    systemd.packages = [ cfg.package ];
-      { description = "Power Management Daemon";
-        path = [ pkgs.glib.out ]; # needed for gdbus
-        serviceConfig =
-          { Type = "dbus";
-            BusName = "org.freedesktop.UPower";
-            ExecStart = "@${cfg.package}/libexec/upowerd upowerd";
-            Restart = "on-failure";
-            # Upstream lockdown:
-            # Filesystem lockdown
-            ProtectSystem = "strict";
-            # Needed by keyboard backlight support
-            ProtectKernelTunables = false;
-            ProtectControlGroups = true;
-            ReadWritePaths = "/var/lib/upower";
-            ProtectHome = true;
-            PrivateTmp = true;
-
-            # Network
-            # PrivateNetwork=true would block udev's netlink socket
-            RestrictAddressFamilies = "AF_UNIX AF_NETLINK";
-
-            # Execute Mappings
-            MemoryDenyWriteExecute = true;
-
-            # Modules
-            ProtectKernelModules = true;
-
-            # Real-time
-            RestrictRealtime = true;
-
-            # Privilege escalation
-            NoNewPrivileges = true;
-          };
-      };
 
     # The upower daemon seems to get stuck after doing a suspend
     # (i.e. subsequent suspend requests will say "Sleep has already