Update on "Move and rename GranularityType -> Granularity"

Summary: Move GranularityType to quant_primitives.py to be
consistent with other similar fields like MappingType and
ZeroPointDomain.

Test Plan: CI

[ghstack-poisoned]

torchao/prototype/awq/api.py

@@ -1,9 +1,9 @@
 import torch
 import torch.nn.functional as F
 
+from torchao.quantization.granularity import PerGroup
 from torchao.quantization.quant_primitives import (
     MappingType,
-    PerGroup,
     ZeroPointDomain,
      _DTYPE_TO_QVALUE_BOUNDS,
 )