[quant] Update qbatch_norm name to qbatch_norm2d (#36494)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36494
Make name consistent with op. Since we have batch_norm2d and batch_norm3d ops
Test Plan:
python test/quantization/test_quantized.py test_batch_norm2d
Imported from OSS
Differential Revision: D21008831
fbshipit-source-id: f81ca71a331d5620fd6a3f6175020a30f2e2566b
