Move dbus stubs to generated package.

internal/platform/implementation/linux/generated/BUILD

@@ -0,0 +1,22 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+licenses(["notice"])
+
+cc_library(
+    name = "types",
+    textual_hdrs = glob(["**/*.h"]),
+    visibility = [
+        "//internal/platform/implementation/linux:__subpackages__",
+    ],
+)