greybus: interface: remove unused interface-version quirk

The interface-version request was just removed so remove the now unused
interface-version quirk.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>