Store/Pass root digests of APEX payload

Root digests of APEX payload are now collected by microdroid_manager and
stored in instance.img and passed to apexd.

Bug: 199371341
Test: MicrodroidHostTestCases
Change-Id: I940347068400822f7d8140c3daf68036f553b087
diff --git a/libs/libavb_rs/bindgen/avb.h b/libs/libavb_rs/bindgen/avb.h
new file mode 100644
index 0000000..b3d5385
--- /dev/null
+++ b/libs/libavb_rs/bindgen/avb.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * 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
+ *
+ *     http://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 <libavb/libavb.h>