Convert libwvdrmengine to soong.

Bug: 37512442
Test: mmm -j50 vendor/widevine/libwvdrmengine/
Change-Id: I45b06b7f14ca4f65031bbc3806808a191156ee7b

libwvdrmengine/oemcrypto/Android.bp

@@ -0,0 +1,20 @@
+//
+// Copyright (C) 2017 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: "liboemcrypto_libwvdrmengine_local",
+    export_include_dirs: ["include"],
+}