[ReleasePR iotcentral] [Hub Generated] Review request for Microsoft.IoTCentral to add version stable/2021-06-01 (#1952)

Create to sync Azure/azure-rest-api-specs#16139
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/iotcentral?expand=1)

Author: msftbot[bot]

schemas/2021-06-01/Microsoft.IotCentral.json

@@ -13,6 +13,17 @@
             "2021-06-01"
           ]
         },
+        "identity": {
+          "oneOf": [
+            {
+              "$ref": "#/definitions/SystemAssignedServiceIdentity"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "Managed service identity (either system assigned, or none)"
+        },
         "location": {
           "type": "string",
           "description": "The resource location."
@@ -134,6 +145,29 @@
         "name"
       ],
       "description": "Information about the SKU of the IoT Central application."
+    },
+    "SystemAssignedServiceIdentity": {
+      "type": "object",
+      "properties": {
+        "type": {
+          "oneOf": [
+            {
+              "type": "string",
+              "enum": [
+                "None",
+                "SystemAssigned"
+              ]
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ]
+        }
+      },
+      "required": [
+        "type"
+      ],
+      "description": "Managed service identity (either system assigned, or none)"
     }
   }
 }