[zero] hotfix master param sync (#4618)

* [zero] add method to update master params

* [zero] update zero plugin

* [plugin] update low level zero plugin

colossalai/interface/model.py

@@ -23,3 +23,14 @@ class ModelWrapper(nn.Module):
 
     def forward(self, *args, **kwargs):
         return self.module(*args, **kwargs)
+
+
+class AMPModelMixin:
+    """This mixin class defines the interface for AMP training.
+    """
+
+    def update_master_params(self):
+        """
+        Update the master parameters for AMP training.
+        """
+        pass