Added todo work

Added todo work to deprecate the broadcasted flag, which is
essentially replaced by the displayed flag.

Test: None
Bug: 143229383
Merged-In: I3907d0d76166a768e57bfa420855e6a0563968a8
Change-Id: I3907d0d76166a768e57bfa420855e6a0563968a8
(cherry picked from commit c38a70a946)

core/java/android/provider/Telephony.java

@@ -4358,6 +4358,7 @@ public final class Telephony {
          * Indicates that whether the message has been broadcasted to the application.
          * <P>Type: BOOLEAN</P>
          */
+        // TODO: deprecate this in S.
         public static final String MESSAGE_BROADCASTED = "message_broadcasted";
 
         /**