Add a11y text for disappearing preference

Test: Talkback
Fixes: 182241259
Change-Id: I99c1ce635c5717e22ee28bc86b51bd3be4b83d91

src/com/android/settings/notification/app/RecentConversationsPreferenceController.java

@@ -167,6 +167,8 @@ public class RecentConversationsPreferenceController extends AbstractPreferenceC
             pref.setOnClearClickListener(() -> {
                 try {
                     mPs.removeRecentConversation(pkg, UserHandle.getUserId(uid), conversationId);
+                    pref.getClearView().announceForAccessibility(
+                            mContext.getString(R.string.recent_convo_removed));
                     parent.removePreference(pref);
                 } catch (RemoteException e) {
                     Slog.w(TAG, "Could not clear recent", e);