fix qconfig import for pytorch 1.10 (#9899)

Author: awaelchli

pytorch_lightning/callbacks/quantization.py

@@ -27,7 +27,7 @@
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 
 if _TORCH_GREATER_EQUAL_1_10:
-    from torch.ao.quantization import QConfig
+    from torch.ao.quantization.qconfig import QConfig
 else:
     from torch.quantization import QConfig