Implement currently tuned ID / channel indication.

Bug: 70939328
Test: it builds
Change-Id: I62011b70b3786b0d5e5ac24eb480a3c52a35f104
diff --git a/broadcastradio/2.0/vts/functional/VtsHalBroadcastradioV2_0TargetTest.cpp b/broadcastradio/2.0/vts/functional/VtsHalBroadcastradioV2_0TargetTest.cpp
index 4ab6cbe..cbe6288 100644
--- a/broadcastradio/2.0/vts/functional/VtsHalBroadcastradioV2_0TargetTest.cpp
+++ b/broadcastradio/2.0/vts/functional/VtsHalBroadcastradioV2_0TargetTest.cpp
@@ -520,6 +520,9 @@
     EXPECT_TRUE(stopResult.isOk());
 }
 
+// TODO(b/70939328): test ProgramInfo's currentlyTunedId and
+// currentlyTunedChannel once the program list is implemented.
+
 }  // namespace vts
 }  // namespace V2_0
 }  // namespace broadcastradio