Update base for Update on "Pass one NDM to backend init"

Take external NDM if it exists, otherwise internal.

Note: by default, xnnpack uses the named_data_map. Constants are not stored with the delegated blob anymore.

Differential Revision: [D73679710](https://our.internmc.facebook.com/intern/diff/D73679710/)

[ghstack-poisoned]

Author: lucylq

extension/flat_tensor/flat_tensor_data_map.cpp

@@ -253,7 +253,8 @@ ET_NODISCARD Result<const char*> FlatTensorDataMap::get_key(
       index,
       num_keys);
 
-  if (flat_tensor_->named_data() != nullptr && index < flat_tensor_->named_data()->size()) {
+  if (flat_tensor_->named_data() != nullptr &&
+      index < flat_tensor_->named_data()->size()) {
     return flat_tensor_->named_data()->Get(index)->key()->c_str();
   } else {
     if (flat_tensor_->named_data() != nullptr) {