libaudiohal@aidl: Make IHalAdapterVendorExtension mandatory

Since IHalAdapterVendorExtension is not stable, it can not be
included into the framework manifest, and thus `isDeclared`
check will never succeed (due to a bug, it could be included
previously, but it is now fixed).

This service is necessary for any vendor because all vendor
HAL implementations have some vendor-specific parameters.
An example implementation is added, which is used by Cuttlefish
and also added to GSI system_ext.

Bug: 321651892
Test: atest audiorouting_tests
Change-Id: Ib529250349da289cecb26bb965f1bfc8e37dc893
diff --git a/services/audioparameterparser/main.cpp b/services/audioparameterparser/main.cpp
new file mode 100644
index 0000000..d22eb55
--- /dev/null
+++ b/services/audioparameterparser/main.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+
+#define LOG_TAG "Audio_ParameterParser"
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+#include "ParameterParser.h"
+
+using vendor::audio::parserservice::ParameterParser;
+
+int main() {
+    // This is a debug implementation, always enable debug logging.
+    android::base::SetMinimumLogSeverity(::android::base::DEBUG);
+
+    auto parser = ndk::SharedRefBase::make<ParameterParser>();
+    const std::string parserFqn =
+            std::string().append(ParameterParser::descriptor).append("/default");
+    binder_status_t status =
+            AServiceManager_addService(parser->asBinder().get(), parserFqn.c_str());
+    if (status != STATUS_OK) {
+        LOG(ERROR) << "failed to register service for \"" << parserFqn << "\"";
+    }
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;  // should not reach
+}