CallNotifier: Ring in PHONE_INCOMING_RING only if it has already rang once.

Call mRinger.ring() for PHONE_INCOMING_RING only if it has already been
called at least once before for this incoming call.  This ensures that
custom ringtone queries have their full alloted time to complete before
falling back to the default ringtone.

Change-Id: Id79e061dbe00ae872ed45d8f752a8f1dbacdcf63
Signed-off-by: chris41g <chriswhite41g@gmail.com>