[TP] ClockRegistry do not wait for plugin manager connected

We no longer need to wait for plugin connected to  use the clock
registry since we can now directly listen to clock list updates from the
clock registry.

1. Remove the suspend func in ClockRegistryProvider
2. Remove all the related providers that wait for the clock registry to
   be ready

Test: Manually test that the clock carousel shows as expected
Bug: 269656371
Change-Id: I73fe5e4222105916cee2a4c489ad915d40459373