Add feature flag to change the CDM version to 18.0.2

[ Merge of http://go/wvgerrit/191139 ]

Adding an initial flag that include identifiable differences when
the feature is enabled or disabled.

This is the same commit as ag/25837302. It was reverted due to
memory size issues. A follow on CL will address that issue to
ease review.

Bug: 311951236
Test: WVTS tests
Change-Id: I995fb8f4158b3529c2d19a2ee5fd8beec0019f7c

libwvdrmengine/aconfig/Android.bp

@@ -0,0 +1,28 @@
+// Copyright (C) 2023 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.
+
+aconfig_declarations {
+    name: "wv_media_drm_flags",
+    package: "com.android.mediadrm.widevine.flags",
+    srcs: [
+        "wv_media_drm_flags.aconfig",
+    ],
+}
+
+cc_aconfig_library {
+    name: "wv_media_drm_flags_c_lib",
+    aconfig_declarations: "wv_media_drm_flags",
+    vendor_available: true,
+    min_sdk_version: "34",
+}