Fix imports of TF MobileViT
# What does this PR do?

Small cleanup in the main init.
_The documentation is not available anymore as the PR was closed or merged._<|||||>It's only the type hints that are wrong, not the actual init.<|||||>> It's only the type hints that are wrong, not the actual init.

Yeah, just figure it out after I posted. Deleted it but you are too fast to answer<|||||>Failures are related to Hub being down, so no blocker to merge.