audiopolicy: engine: Add ProductStrategy common code

-Adds new Engine APIs for Product Strategy management
-Adds a common engine code to handle product strategies
-Adds a parsing configuration library to feed the strategies
-Prepare both engine for the switch

Test: make
Change-Id: I00f57ece798893bc6f9aa9ed54a3e5237e8d5cf1
diff --git a/services/audiopolicy/engine/interface/Android.bp b/services/audiopolicy/engine/interface/Android.bp
new file mode 100644
index 0000000..2ea42b6
--- /dev/null
+++ b/services/audiopolicy/engine/interface/Android.bp
@@ -0,0 +1,19 @@
+// Copyright (C) 2018 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.
+
+cc_library_headers {
+    name: "libaudiopolicyengine_interface_headers",
+    host_supported: true,
+    export_include_dirs: ["."],
+}