TCMS should bind the TCS when onSelectionEvent/onTextClassifierEvent ...

is called

If the system TC (e.g. AiAi) only depends on the default system TC
(i.e. ExtService) for logging purposes (i.e. onSelectionEvent()
and onTextClassifierEvent()), the TCS in ExtServices will never be bound
and the log events will never be delivered to the system default TC.

BUG: 155636992

Test: Enable verbose logging and check the logcat
Change-Id: I5b77761b8fb0d12906e205200c11e26833b81c1c