Ergonomics of `Interface::new` device parameter

[TomCrypto]

Currently the Interface struct needs a Device to construct itself via Interface::new, but all it does with it is call capabilities on it. In some cases (e.g. embedded code) we would like to instantiate the Interface before the device object can be constructed, even though we typically know the device capabilities upfront.

Should Interface::new directly take a DeviceCapabilities parameter instead of a Device?