Increase # of tables threshold in flatbuffer verifier

We were able to encounter AOS configs that exceeded this threshold...

Change-Id: Iac5fe8b2d671d82775701a255f9fee94f9326ff8
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/config_flattener.cc b/aos/config_flattener.cc
index 5bd3cf7..b089d24 100644
--- a/aos/config_flattener.cc
+++ b/aos/config_flattener.cc
@@ -45,7 +45,9 @@
   aos::FlatbufferDetachedBuffer<Configuration> merged_config =
       configuration::MergeConfiguration(config, schemas);
   // In case we've done something overly weird to the flatbuffer...
-  CHECK(merged_config.Verify());
+  CHECK(merged_config.Verify())
+      << ": Failed to verify flatbuffer. NOTE: Very large flatbuffers could be "
+         "exceeding max_tables in flatbuffers::Verifier.";
 
   const std::string merged_config_json =
       FlatbufferToJson(&merged_config.message(), {.multi_line = true});