remove auto_map (handled by vLLM plugin)

config.json

@@ -76,8 +76,5 @@
     "rms_norm_eps": 1e-05,
     "spatial_merge_size": 2
   },
-  "vocab_size": 120818,
-  "auto_map": {
-    "AutoConfig": "configuration_brain_ocr.BrainOCRConfig"
-  }
+  "vocab_size": 120818
 }