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/tests/AudioPolicyTestClient.h b/services/audiopolicy/tests/AudioPolicyTestClient.h
index 71e34e3..2ae0e97 100644
--- a/services/audiopolicy/tests/AudioPolicyTestClient.h
+++ b/services/audiopolicy/tests/AudioPolicyTestClient.h
@@ -25,6 +25,9 @@
     virtual ~AudioPolicyTestClient() = default;
 
     // AudioPolicyClientInterface Implementation
+    status_t getAudioPolicyConfig(media::AudioPolicyConfig* /*config*/) override {
+        return INVALID_OPERATION;
+    }
     audio_module_handle_t loadHwModule(const char* /*name*/) override {
         return AUDIO_MODULE_HANDLE_NONE;
     }