Add scale and zp dtype in preq

Differential Revision: D73292389

Pull Request resolved: #2080

Author: YIWENX14

torchao/quantization/GPTQ.py

@@ -933,7 +933,7 @@ def linear_forward_8da4w(
     groupsize,
     precision,
 ):
-    x = per_token_dynamic_quant(x)
+    x = per_token_dynamic_quant(x, scale_dtype=precision, zero_point_dtype=precision)
     # TODO: verify and remove following reshape code
     # origin_x_size = x.size()
     # x = x.reshape(-1, origin_x_size[-1])