portable/service: Reuse meta-maintainers.nix (#435512)

nixos/modules/system/service/portable/service.nix

@@ -10,6 +10,7 @@ in
   # https://nixos.org/manual/nixos/unstable/#modular-services
   _class = "service";
   imports = [
+    ../../../../../modules/generic/meta-maintainers.nix
     ../../../misc/assertions.nix
     ./config-data.nix
   ];
@@ -43,9 +44,5 @@ in
         '';
       };
     };
-    # TODO: use https://github.com/NixOS/nixpkgs/pull/431450
-    meta = lib.mkOption {
-      description = "The maintainers of this module. This is currently a placeholder option whose value may not evaluate to anything useful until https://github.com/NixOS/nixpkgs/pull/431450 is available and used here.";
-    };
   };
 }