change sbi signature

interfaces/southbound/sbi.go

@@ -23,5 +23,5 @@ type SouthboundInterface interface { // nolint
 	Schema() *ytypes.Schema
 	ID() uuid.UUID
 	Type() spb.Type
-	Unmarshal() func([]byte, []string, ygot.GoStruct, ...ytypes.UnmarshalOpt) error
+	Unmarshal() func([]byte, []string, ygot.ValidatedGoStruct, ...ytypes.UnmarshalOpt) error
 }