Revert "Revert "audio policy: concurrent capture""

This reverts commit df628924e691e01da190c1ac5db173304442e54a.

Bug: 120588242
Bug: 111438757
Test: make
Change-Id: If58ff2143fdb744678bb84394598104ced01f5b9
diff --git a/media/libaudioclient/AudioSystem.cpp b/media/libaudioclient/AudioSystem.cpp
index ec36ed7..efe65bb 100644
--- a/media/libaudioclient/AudioSystem.cpp
+++ b/media/libaudioclient/AudioSystem.cpp
@@ -917,11 +917,11 @@
             config, flags, selectedDeviceId, portId);
 }
 
-status_t AudioSystem::startInput(audio_port_handle_t portId, bool *silenced)
+status_t AudioSystem::startInput(audio_port_handle_t portId)
 {
     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
     if (aps == 0) return PERMISSION_DENIED;
-    return aps->startInput(portId, silenced);
+    return aps->startInput(portId);
 }
 
 status_t AudioSystem::stopInput(audio_port_handle_t portId)