[quant] follow up fixes for prepare_fx/prepare_qat_fx calls in classyvision (#105) (#78660)
Summary:
X-link: https://github.com/fairinternal/ClassyVision/pull/105
As follow up for https://github.com/pytorch/pytorch/pull/76496, we fixes the TODOs in quantization tests
by providing correct example_inputs in the tests
Test Plan:
classyvision sandcastle and ossci
**Static Docs Preview: classyvision**
|[Full Site](https://our.intern.facebook.com/intern/staticdocs/eph/D36818665/V1/classyvision/)|
|**Modified Pages**|
Differential Revision: D36818665
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78660
Approved by: https://github.com/vkuzo
