Move files from quantization/prototype -> prototype/quantization (#1187)

Author: jainapurva

test/quantization/test_mixed_precision.py renamed to test/prototype/test_mixed_precision.py

@@ -4,7 +4,7 @@
 import torch.nn as nn
 from torchao.quantization import quantize_, int8_weight_only, int4_weight_only
 from torchao.quantization.utils import compute_error
-from torchao.quantization.prototype.mixed_precision.scripts.naive_intNwo import intN_weight_only
+from torchao.prototype.quantization.mixed_precision.scripts import intN_weight_only
 
 _CUDA_IS_AVAILABLE = torch.cuda.is_available()