Remove the redundant parameters from createTrack_l()

AudioRecord::openRecord_l() code was refactored earlier to
remove the redundant parameters:
    > Change-Id: I124dce344b1d11c2dd66ca5e2c9aec0c52c230e2

This changelist refactors AudioTrack similarly.

Change-Id: Iefd2bd662870ea81d04eff7b7c26f9c8b0dadd26
diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index cb67321..3a60217 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -634,13 +634,7 @@
 
             // caller must hold lock on mLock for all _l methods
 
-            status_t createTrack_l(audio_stream_type_t streamType,
-                                 uint32_t sampleRate,
-                                 audio_format_t format,
-                                 size_t frameCount,
-                                 audio_output_flags_t flags,
-                                 const sp<IMemory>& sharedBuffer,
-                                 size_t epoch);
+            status_t createTrack_l(size_t epoch);
 
             // can only be called when mState != STATE_ACTIVE
             void flush_l();