Hello,
I too am faced with this need. It arises in respect to the Administrator library not having the same effect on disabling a built in device's access on a phone/tablet as opposed to a Chromebook. Despite disabling a device by the Administrator, and the apk showing no error, the device is still functional on the Chromebook. Would I need to alter the above to be something to the effect of:
AddManifestText(<uses-feature android:name="android.permission.BIND_DEVICE_ADMIN" required="true" />)