[dice] Move dice bindgens next to their safe wrapper library

This cl moves the open-dice cbor and bcc bindgens and their tests
next to their safe wrapper library so that we can limit their
visibility only to :__subpackges__ to align with the rust bindgen
recommendation[1].

[1] https://source.android.com/docs/setup/build/rust/building-rust-modules/source-code-generators/bindgen-modules#visibility-and-linkage
Bug: 267575445
Test: m pvmfw_img microdroid_manager

Change-Id: I04e6861600c8d40120041e7eaec7fb468a4dc00a
diff --git a/diced/open_dice/bindgen/dice.h b/diced/open_dice/bindgen/dice.h
new file mode 100644
index 0000000..47fe911
--- /dev/null
+++ b/diced/open_dice/bindgen/dice.h
@@ -0,0 +1,18 @@
+// Copyright 2021 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.
+
+#pragma once
+
+#include <dice/dice.h>
+#include <dice/ops.h>