Disable "crashed dialer" message when Dialer doesn't implement ICS.

When Dialer doesn't implement the InCallService, removing the "crashed"
message we're showing.  Since the role does not currently require the
ICS implementation, we should not show the notification when one is not
present.

Fixes: 159650984
Test: Re-ran unit tests; verify all pass.
Test: Verify using 3p app that no "dialer crash" message is shown.
Change-Id: I4df10e337d2895dcfb3b010fd1e53aff657cc6eb