Make dvr tests a separate module

Test: atest VtsHalTvTunerV1_0TargetTest
Bug: 150989084
Change-Id: I35d717f357b176d5cbec5d154f4df30fd2c4a18e
diff --git a/tv/tuner/1.0/default/Tuner.cpp b/tv/tuner/1.0/default/Tuner.cpp
index e39333c..14a4289 100644
--- a/tv/tuner/1.0/default/Tuner.cpp
+++ b/tv/tuner/1.0/default/Tuner.cpp
@@ -236,6 +236,15 @@
     }
 }
 
+void Tuner::frontendStartTune(uint32_t frontendId) {
+    map<uint32_t, uint32_t>::iterator it = mFrontendToDemux.find(frontendId);
+    uint32_t demuxId;
+    if (it != mFrontendToDemux.end()) {
+        demuxId = it->second;
+        mDemuxes[demuxId]->startFrontendInputLoop();
+    }
+}
+
 }  // namespace implementation
 }  // namespace V1_0
 }  // namespace tuner