[quant][fx] Update name of packed weight attributes (#51259)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51259
Store the FQN of the module that is using the packed weights (the quantized op)
In the case of fusion we update the scope mapping to store the module path of the fused node.
Test Plan:
python test/test_quantization.py test_packed_weight_fused_op
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D26117964
fbshipit-source-id: 9d929997baafb1c91063dd9786a451b0040ae461
