Add patch_size

Set patch_size to 32 for use with AutoConfig.from_pretrained

config.json

@@ -28,6 +28,7 @@
     "num_classes": 1000,
     "pool_size": null,
     "first_conv": "patch_embed.proj",
-    "classifier": "head"
+    "classifier": "head",
+    "patch_size": 32
   }
 }