Fix call to reference quantize (#1944)

src/ngraph/runtime/cpu/cpu_emitter.cpp

@@ -4824,7 +4824,7 @@ namespace ngraph
                     writer << "            {" << join(args[0].get_shape()) << "},\n";
                     writer << "            {" << join(args[1].get_shape()) << "},\n";
                     writer << "            {" << join(quantize->get_axes()) << "},\n";
-                    writer << "            static_cast<op::Quantize::RoundMode>("
+                    writer << "            static_cast<ngraph::op::Quantize::RoundMode>("
                            << static_cast<int>(quantize->get_round_mode()) << "));\n";
                 }
             }