[quant][fx][graphmode][fix] Only insert observers for fixed qparam ops (#53330)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53330
Fixed a condition check for fixed qparam ops, previously we were including CopyNodes as well
Test Plan:
python test/test_quantization.py TestQuantizeFxOps.test_fixed_qparams_ops_fp16
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D26836867
fbshipit-source-id: 8c486155244f852e675a938c3f4237f26505671c