Update tuner default AIDL HAL.

*) Use tuner AIDL HAL return values.
*) Replace mTunerService with mTuner to avoid confusing.
*) Merge other HIDL HAL changes.
   *) ag/15371813, ag/15371814 and ag/15371815.

Bug: 191825295
Test: make and run VtsHalTvTunerTargetTest
Change-Id: Ibbf94c4fc36c3bda94a7e0f3e0697c83ac414d0e
diff --git a/tv/tuner/aidl/default/Demux.h b/tv/tuner/aidl/default/Demux.h
index 9f96d0f..4d9b7fe 100644
--- a/tv/tuner/aidl/default/Demux.h
+++ b/tv/tuner/aidl/default/Demux.h
@@ -95,7 +95,7 @@
 
   private:
     // Tuner service
-    std::shared_ptr<Tuner> mTunerService;
+    std::shared_ptr<Tuner> mTuner;
 
     // Frontend source
     std::shared_ptr<Frontend> mFrontend;