Add AudioSystem.listDeclaredDevicePorts method

This is useful for tests that exercise external device
connection/disconnection scenarios. 'listAudioPorts'
returns ports for currently connected devices only.

Bug: 273252382
Test: atest audiopolicymanager_tests
Change-Id: I7d235d993235e21696002448ebf09b27ad6955a6
diff --git a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
index b559318..af7be52 100644
--- a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
+++ b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
@@ -1541,6 +1541,17 @@
     return Status::ok();
 }
 
+Status AudioPolicyService::listDeclaredDevicePorts(media::AudioPortRole role,
+                                                    std::vector<media::AudioPortFw>* _aidl_return) {
+    Mutex::Autolock _l(mLock);
+    if (mAudioPolicyManager == NULL) {
+        return binderStatusFromStatusT(NO_INIT);
+    }
+    AutoCallerClear acc;
+    return binderStatusFromStatusT(mAudioPolicyManager->listDeclaredDevicePorts(
+                    role, _aidl_return));
+}
+
 Status AudioPolicyService::getAudioPort(int portId,
                                         media::AudioPortFw* _aidl_return) {
     audio_port_v7 port{ .id = portId };