Send a unlocked message for test coverage

Bug: 215435869
Test: atest VtsHalTvTunerTargetTest
Test: atest android.media.tv.tuner.cts
Change-Id: I8e63eac1e96ab9a638f3aa04dc0bfd39cbdd52fa
diff --git a/tv/tuner/aidl/default/Frontend.cpp b/tv/tuner/aidl/default/Frontend.cpp
index 056d014..3f7797c 100644
--- a/tv/tuner/aidl/default/Frontend.cpp
+++ b/tv/tuner/aidl/default/Frontend.cpp
@@ -393,6 +393,13 @@
 
     {
         FrontendScanMessage msg;
+        msg.set<FrontendScanMessage::Tag::isLocked>(false);
+        mCallback->onScanMessage(FrontendScanMessageType::LOCKED, msg);
+        mIsLocked = false;
+    }
+
+    {
+        FrontendScanMessage msg;
         msg.set<FrontendScanMessage::Tag::isLocked>(true);
         mCallback->onScanMessage(FrontendScanMessageType::LOCKED, msg);
         mIsLocked = true;