Add new enum values to DataBindingMode (Azure#18690)

Author: keriehm

specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2021-03-01-preview/mfe.json

@@ -6148,7 +6148,12 @@
       "enum": [
         "Mount",
         "Download",
-        "Upload"
+        "Upload",
+        "ReadOnlyMount",
+        "ReadWriteMount",
+        "Direct",
+        "EvalMount",
+        "EvalDownload"
       ],
       "type": "string",
       "x-ms-enum": {