Revert "Use aidl interface for Widevine service."

This reverts commit 96a8ccd4a1.

Reason for revert:
Could break DeviceManifest/SingleManifestTest#ManifestAidlHalsServed

Bug: 200055138
Bug: 170964303
Bug: 217241995
Change-Id: I9c42df15defec428c9ef8c62439c63d4a603fee6

libwvdrmengine/aidl_include/WVCreatePluginFactories.h

@@ -1,26 +0,0 @@
-//
-// Copyright 2021 Google LLC. All Rights Reserved. This file and proprietary
-// source code may only be used and distributed under the Widevine License
-// Agreement.
-//
-
-#ifndef WV_CREATE_PLUGIN_FACTORIES_H_
-#define WV_CREATE_PLUGIN_FACTORIES_H_
-
-#include "WVCryptoFactory.h"
-#include "WVDrmFactory.h"
-
-namespace wvdrm {
-namespace hardware {
-namespace drm {
-namespace widevine {
-
-std::shared_ptr<WVDrmFactory> createDrmFactory();
-std::shared_ptr<WVCryptoFactory> createCryptoFactory();
-
-}  // namespace widevine
-}  // namespace drm
-}  // namespace hardware
-}  // namespace wvdrm
-
-#endif  // WV_CREATE_PLUGIN_FACTORIES_H_