AudioFlinger: Fix VolumeShaper initialization for DirectOutputThread

Avoids temporary frequent polling after creation.
Offload not affected.

Test: compile
Change-Id: I868a80ee25553c16083510ef6b79782c414a39a1
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 31a8c7d..9f838a3 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -5329,16 +5329,9 @@
 // ----------------------------------------------------------------------------
 
 AudioFlinger::DirectOutputThread::DirectOutputThread(const sp<AudioFlinger>& audioFlinger,
-        AudioStreamOut* output, audio_io_handle_t id, audio_devices_t device, bool systemReady)
-    :   PlaybackThread(audioFlinger, output, id, device, DIRECT, systemReady)
-{
-}
-
-AudioFlinger::DirectOutputThread::DirectOutputThread(const sp<AudioFlinger>& audioFlinger,
-        AudioStreamOut* output, audio_io_handle_t id, uint32_t device,
+        AudioStreamOut* output, audio_io_handle_t id, audio_devices_t device,
         ThreadBase::type_t type, bool systemReady)
     :   PlaybackThread(audioFlinger, output, id, device, type, systemReady)
-        , mVolumeShaperActive(false)
 {
 }