[quant][graphmode][fx][fp16] Add fp16 support for torch.sum (#52811)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/52811
Test Plan:
python test/test_quantization.py TestQuantizeFxOps.test_sum
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D26655619
fbshipit-source-id: 642e0de47d0da7bd1abe1e981819de33e84c32f3
