Complete TunerFrontend aidl interface and implementation

Test: make
Bug: 159067322
Change-Id: I97bc2431be1ba7b0a807b6dd06b609ad2c885dde
diff --git a/services/tuner/TunerLnb.h b/services/tuner/TunerLnb.h
index e80b97e..500d072 100644
--- a/services/tuner/TunerLnb.h
+++ b/services/tuner/TunerLnb.h
@@ -49,6 +49,8 @@
     Status sendDiseqcMessage(const vector<uint8_t>& diseqcMessage) override;
     Status close() override;
 
+    int getId() { return mId; }
+
     struct LnbCallback : public ILnbCallback {
         LnbCallback(const shared_ptr<ITunerLnbCallback> tunerLnbCallback)
                 : mTunerLnbCallback(tunerLnbCallback) {};