Address review comments

Author: preetha-intel

onnxruntime/core/providers/openvino/backends/basic_backend.cc

@@ -282,7 +282,9 @@ void BasicBackend::PopulateConfigValue(ov::AnyMap& device_config) {
         session_context_.device_type.find("HETERO") == 0 ||
         session_context_.device_type.find("MULTI") == 0) {
       //// Parse to get the device mode (e.g., "AUTO:CPU,GPU" -> "AUTO")
+      std::unordered_set<std::string> supported_mode = {"AUTO", "HETERO", "MULTI"};
       auto device_mode = find_device_type_mode(session_context_.device_type);
+      ORT_ENFORCE(supported_mode.find(device_mode)!=supported_mode.end(), " Invalid device mode is passed : " , session_context_.device_type);
       // Parse individual devices (e.g., "AUTO:CPU,GPU" -> ["CPU", "GPU"])
       auto individual_devices = parse_individual_devices(session_context_.device_type);
       if (!device_mode.empty()) individual_devices.emplace_back(device_mode);
@@ -297,8 +299,6 @@ void BasicBackend::PopulateConfigValue(ov::AnyMap& device_config) {
         }
       }
     } else {
-      std::unordered_set<std::string> valid_ov_devices = {"CPU", "GPU", "NPU", "AUTO", "HETERO", "MULTI"};
-
       if (target_config.count(session_context_.device_type)) {
         auto supported_properties = OVCore::Get()->core.get_property(session_context_.device_type,
                                                                      ov::supported_properties);