Revert "Convert libwvdrmengine to soong."

This change introduced b/38487636 "Distorted video observed when
playing purchased/rented movie in Google play movies & TV app."

Before resubmitting an updated variant of the original CL, please
test playback with Play Movies and the GTS media tests. 

This reverts commit 33f9979b2b.

Change-Id: I4ec2e6fe81323e91e4b62288755c967999e81041

libwvdrmengine/cdm/core/src/Android.bp

@@ -1,27 +0,0 @@
-//
-// 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_static {
-    name: "libcdm_protos",
-    srcs: [
-        "device_files.proto",
-        "license_protocol.proto",
-    ],
-    proto: {
-        type: "lite",
-        export_proto_headers: true,
-    },
-}