Allow device bindings to be destroyed

Summary: Ref T9762. Currently it is not possible to destroy an Alamanac device because any associate bindings cannot be destroyed.

Test Plan: Destroyed an Almanac device.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin

Maniphest Tasks: T9762

Differential Revision: https://secure.phabricator.com/D14461