Remove unused code (#476)

Summary:
This is unused code

Test Plan:
just unused code, making sure CI passes

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Author: jerryzh168

torchao/quantization/smoothquant.py

@@ -15,8 +15,6 @@
 import torch
 import torch.nn.functional as F
 
-import torchao.quantization.quant_api as quant_api
-
 from .utils import (
     dynamically_quantize_per_channel,
     quant_int8_dynamic_per_token_linear,