int4 quantization cpu fix

[likholat]

int4 quantization on CPU causes:

Traceback (most recent call last):
  File "/home/user/gpt-fast/quantize.py", line 622, in <module>
    quantize(args.checkpoint_path, args.mode, args.groupsize, args.calibration_tasks, args.calibration_limit, args.calibration_seq_length, args.pad_calibration_inputs, args.percdamp, args.blocksize, args.label)
  File "/home/user/gpt-fast/quantize.py", line 569, in quantize
    quantized_state_dict = quant_handler.create_quantized_state_dict()
  File "/home/user/test_env/lib/python3.10/site-packages/torch/utils/_contextlib.py", line 115, in decorate_context
    return func(*args, **kwargs)
  File "/home/user/gpt-fast/quantize.py", line 434, in create_quantized_state_dict
    weight.to(torch.bfloat16).to(device=device), self.groupsize, self.inner_k_tiles
  File "/home/user/test_env/lib/python3.10/site-packages/torch/cuda/__init__.py", line 293, in _lazy_init
    torch._C._cuda_init()
RuntimeError: No HIP GPUs are available

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[likholat]

@yanboliang could you please take a look