fix(smartdevicemanagement): update the API

#### smartdevicemanagement:v1

The following keys were changed:
- schemas.GoogleHomeEnterpriseSdmV1ParentRelation.description

discovery/smartdevicemanagement-v1.json

@@ -345,7 +345,7 @@
       }
     }
   },
-  "revision": "20201022",
+  "revision": "20210224",
   "rootUrl": "https://smartdevicemanagement.googleapis.com/",
   "schemas": {
     "GoogleHomeEnterpriseSdmV1Device": {
@@ -469,7 +469,7 @@
       "type": "object"
     },
     "GoogleHomeEnterpriseSdmV1ParentRelation": {
-      "description": "Represents device relationships, for instance, structure/room to which the device is assigned to. For now this is only filled in the enterprise flow.",
+      "description": "Represents device relationships, for instance, structure/room to which the device is assigned to.",
       "id": "GoogleHomeEnterpriseSdmV1ParentRelation",
       "properties": {
         "displayName": {

src/apis/smartdevicemanagement/v1.ts

@@ -208,7 +208,7 @@ export namespace smartdevicemanagement_v1 {
     structures?: Schema$GoogleHomeEnterpriseSdmV1Structure[];
   }
   /**
-   * Represents device relationships, for instance, structure/room to which the device is assigned to. For now this is only filled in the enterprise flow.
+   * Represents device relationships, for instance, structure/room to which the device is assigned to.
    */
   export interface Schema$GoogleHomeEnterpriseSdmV1ParentRelation {
     /**