change sbi signature

interfaces/southbound/sbi.go

@@ -19,9 +19,9 @@ type SouthboundInterface interface { // nolint
 	// SetNode injects SBI specific model
 	// representation to the transport.
 	// Needed for type assertion.
-	SetNode() func(schema *yang.Entry, root interface{}, path *gpb.Path, val interface{}, opts ...ytypes.SetNodeOpt) error
+	SetNode(schema *yang.Entry, root interface{}, path *gpb.Path, val interface{}, opts ...ytypes.SetNodeOpt) error
 	Schema() *ytypes.Schema
 	ID() uuid.UUID
 	Type() spb.Type
-	Unmarshal() func([]byte, []string, ygot.ValidatedGoStruct, ...ytypes.UnmarshalOpt) error
+	Unmarshal([]byte, []string, ygot.ValidatedGoStruct, ...ytypes.UnmarshalOpt) error
 }