APM: Implementing configuration loading from AIDL HAL

The main change is to utilize 'getAudioPolicyConfig'
to receive the HAL-provided configuration from
the AudioFlinger and initialize runtime structures
from it.

Accompanying changes:
 - made `libaudiopolicycomponents` a shared library;
 - added or moved around necessary conversion functions;

Bug: 205884982
Test: run CF with AIDL HAL and compare APM dump A/B
Test: m audiopolicy_fuzzer
Test: atest audio_health_tests
Test: atest audio_aidl_ndk_conversion_tests
Change-Id: I7d0f48bf4d9d4bdaa46246aa4dfbcc49e835c6b6
diff --git a/services/audiopolicy/enginedefault/src/Engine.cpp b/services/audiopolicy/enginedefault/src/Engine.cpp
index 0fa0e0e..e2f42da 100644
--- a/services/audiopolicy/enginedefault/src/Engine.cpp
+++ b/services/audiopolicy/enginedefault/src/Engine.cpp
@@ -35,10 +35,7 @@
 #include <utils/String8.h>
 #include <utils/Log.h>
 
-namespace android
-{
-namespace audio_policy
-{
+namespace android::audio_policy {
 
 struct legacy_strategy_map { const char *name; legacy_strategy id; };
 static const std::vector<legacy_strategy_map>& getLegacyStrategy() {
@@ -59,8 +56,18 @@
     return legacyStrategy;
 }
 
+status_t Engine::loadFromHalConfigWithFallback(
+        const media::audio::common::AudioHalEngineConfig& aidlConfig) {
+    return loadWithFallback(aidlConfig);
+}
+
 status_t Engine::loadFromXmlConfigWithFallback(const std::string& xmlFilePath) {
-    auto result = EngineBase::loadAudioPolicyEngineConfig(xmlFilePath);
+    return loadWithFallback(xmlFilePath);
+}
+
+template<typename T>
+status_t Engine::loadWithFallback(const T& configSource) {
+    auto result = EngineBase::loadAudioPolicyEngineConfig(configSource);
     ALOGE_IF(result.nbSkippedElement != 0,
              "Policy Engine configuration is partially invalid, skipped %zu elements",
              result.nbSkippedElement);
@@ -73,6 +80,7 @@
     return OK;
 }
 
+
 status_t Engine::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
 {
     switch(usage) {
@@ -794,5 +802,4 @@
                                            AUDIO_FORMAT_DEFAULT);
 }
 
-} // namespace audio_policy
-} // namespace android
+} // namespace android::audio_policy