Implement currently tuned ID / channel indication.

Bug: 70939328
Test: it builds
Change-Id: I62011b70b3786b0d5e5ac24eb480a3c52a35f104
diff --git a/broadcastradio/common/utils2x/Utils.cpp b/broadcastradio/common/utils2x/Utils.cpp
index 10a155b..e0337b4 100644
--- a/broadcastradio/common/utils2x/Utils.cpp
+++ b/broadcastradio/common/utils2x/Utils.cpp
@@ -206,6 +206,9 @@
     };
 
     switch (getType(id)) {
+        case IdentifierType::INVALID:
+            expect(false, "IdentifierType::INVALID");
+            break;
         case IdentifierType::AMFM_FREQUENCY:
         case IdentifierType::DAB_FREQUENCY:
         case IdentifierType::DRMO_FREQUENCY: