Hide Adhoc conference call API.

Marking the adhoc conference call API as @hide.

Test: make -j update-api
Bug: 148165780
Change-Id: I447ec317c66f0c1b4e7a828635b5dcf8b144e32a
diff --git a/telecomm/java/android/telecom/TelecomManager.java b/telecomm/java/android/telecom/TelecomManager.java
index f1dca03..7e5fd46 100644
--- a/telecomm/java/android/telecom/TelecomManager.java
+++ b/telecomm/java/android/telecom/TelecomManager.java
@@ -1827,8 +1827,8 @@
      *            {@link #registerPhoneAccount}.
      * @param extras A bundle that will be passed through to
      *            {@link ConnectionService#onCreateIncomingConference}.
+     * @hide
      */
-
     public void addNewIncomingConference(@NonNull PhoneAccountHandle phoneAccount,
             @NonNull Bundle extras) {
         try {
@@ -2066,6 +2066,7 @@
      *
      * @param participants List of participants to start conference with
      * @param extras Bundle of extras to use with the call
+     * @hide
      */
     @RequiresPermission(android.Manifest.permission.CALL_PHONE)
     public void startConference(@NonNull List<Uri> participants,