Update preprocessor_config.json

preprocessor_config.json

@@ -6,5 +6,9 @@
   "border_ratio": 0.20,
   "image_mean": [0.5, 0.5, 0.5],
   "image_std": [0.5, 0.5, 0.5],
-  "preprocessor_class": "LRMImageProcessor"
-}
+  "_class_name": "LRMImageProcessor",
+  "processor_class": "processor.LRMImageProcessor",
+  "auto_map": {
+    "AutoImageProcessor": "processor.LRMImageProcessor"
+  }
+}