Warning when wiring enable using __call__ syntax

[leonardt]

See https://github.com/phanrahan/magma/pull/1363/files for an example, likely due to the normal call logic skipping clock types. I think this logic is there to allow wiring of registers using call without having to explicitly provide the clock.

I think if the argument is explicitly provided like in the example above, the warning shouldn't fire.

[leonardt]

Warning example

Note: it may be that the wiring is working fine but the warning is a false positive