Refine tuner aidl hal threads.

Bug: 197763854
Test: VtsHalTvTunerTargetTest
Test: atest android.media.tv.tuner.cts
Test: sampletunertvinput
Change-Id: Id707438178ed93731919f0155cab805436147f86
diff --git a/tv/tuner/aidl/default/Dvr.h b/tv/tuner/aidl/default/Dvr.h
index 586f885..ad8728e 100644
--- a/tv/tuner/aidl/default/Dvr.h
+++ b/tv/tuner/aidl/default/Dvr.h
@@ -129,7 +129,7 @@
      * If a specific filter's writing loop is still running
      */
     std::atomic<bool> mDvrThreadRunning;
-    bool mKeepFetchingDataFromFrontend;
+
     /**
      * Lock to protect writes to the FMQs
      */