Remove _dequantize_per_channel in the pattern (#26680)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26680
This was introduced before under the assumption that we'll have a qconv_per_tensor_affine
and a qconv_per_channel_affine, but turns out we don't have these, so we'll remove
thse functions.
Test Plan:
python test/test_jit.py 'TestJit.test_quant_fusion'
Imported from OSS
Differential Revision: D17542607
fbshipit-source-id: b90ce5738170f0922bdc2eb1c4dbecd930f68a48
