Notify new adding calls if the ICS has already bound.

For some reason, ICS may got bound before a new call added to
InCallController. In these cases, make sure that ICS got notified about
these calls.

Bug: 193596941
Test: TelecomUnitTests, manually test if a new incoming call during VOIP
can route to BT properly

Change-Id: Id4835922af707c7aa87b03f14af4eb61df2aca77