Increase the batch size from mobilenet training
Summary: Increase the batch size from 32 to 96 according to the original paper's evaluation setup.
https://github.com/pytorch/benchmark/issues/155
Test Plan:
```
python test.py -k "test_mobilenet_v2_train_cuda"
python test.py -k "test_mobilenet_v2_train_cpu"
python test.py -k "test_mobilenet_v2_quantized_qat_train_cuda"
python test.py -k "test_mobilenet_v2_quantized_qat_train_cpu"
```
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