DO NOT MERGE ANYWHERE - Hack to disable MTP mode on Clockwork devices.

Android currently forces USB into MTP mode if there was no modes
specified. This causes issues on Clockwork devices as they do not
support MTP.

The hack stops this behaviour, and also sets MTP mode back to none.

Bug: 25547826
Bug: 25582050
Bug: 25244201
Change-Id: I772e35d0a5db51b17e9d71c59e6a157dabb1d296