Make metadata field mandatory for program info struct.

Test: VTS, manual
Change-Id: I532dbb0f3d9cb5194265c67fd1328bce55e43b9d
diff --git a/broadcastradio/1.0/ITuner.hal b/broadcastradio/1.0/ITuner.hal
index 5e2bffe..ae4b284 100644
--- a/broadcastradio/1.0/ITuner.hal
+++ b/broadcastradio/1.0/ITuner.hal
@@ -103,11 +103,9 @@
 
     /*
      * Retrieve current station information.
-     * @param withMetadata True if Metadata should be returned, false otherwise.
      * @return result OK if scan successfully started
      *                NOT_INITIALIZED if another error occurs
      * @return info Current program information.
      */
-    getProgramInformation(bool withMetadata)
-            generates(Result result, ProgramInfo info);
+    getProgramInformation() generates(Result result, ProgramInfo info);
 };