Plumb APM configuration retrieval from HAL

Add 'AudioHwModule' and 'AudioPolicyConfig' AIDL types
to represent the APM configuration. Add 'getAudioPolicyConfig'
method to 'IAudioFlinger' interface. Implement it for
the AIDL HAL case. Add missing method to 'DeviceHalInterface'.

Remove 'isSpeakerDrcEnabled' from 'AudioPolicyConfig'
as it is not used anywhere in the framework.

Bug: 205884982
Test: atest audiopolicy_tests
Test: atest audiosystem_tests
Test: atest audio_health_tests
Test: m audiopolicy_fuzzer
Change-Id: Icaf043085373ec661be37d4a7a5ed4356aeb4bbe
diff --git a/services/audiopolicy/service/AudioPolicyClientImpl.cpp b/services/audiopolicy/service/AudioPolicyClientImpl.cpp
index 887f210..13e682b 100644
--- a/services/audiopolicy/service/AudioPolicyClientImpl.cpp
+++ b/services/audiopolicy/service/AudioPolicyClientImpl.cpp
@@ -27,6 +27,18 @@
 
 /* implementation of the client interface from the policy manager */
 
+status_t AudioPolicyService::AudioPolicyClient::getAudioPolicyConfig(
+        media::AudioPolicyConfig *config)
+{
+    sp<IAudioFlinger> af = AudioSystem::get_audio_flinger();
+    if (af == 0) {
+        ALOGW("%s: could not get AudioFlinger", __func__);
+        return AUDIO_MODULE_HANDLE_NONE;
+    }
+
+    return af->getAudioPolicyConfig(config);
+}
+
 audio_module_handle_t AudioPolicyService::AudioPolicyClient::loadHwModule(const char *name)
 {
     sp<IAudioFlinger> af = AudioSystem::get_audio_flinger();
diff --git a/services/audiopolicy/service/AudioPolicyService.h b/services/audiopolicy/service/AudioPolicyService.h
index 981951a..4710a8a 100644
--- a/services/audiopolicy/service/AudioPolicyService.h
+++ b/services/audiopolicy/service/AudioPolicyService.h
@@ -735,6 +735,8 @@
         explicit AudioPolicyClient(AudioPolicyService *service) : mAudioPolicyService(service) {}
         virtual ~AudioPolicyClient() {}
 
+        virtual status_t getAudioPolicyConfig(media::AudioPolicyConfig *config);
+
         //
         // Audio HW module functions
         //