removed the openmoko part from the nas server task
this part only drags in dfu-util which does not build under most distro's
openmoko users are very unlikely to run a NAS on their device, and even
if they want to and need dfu-util, they can easily install afterwards
(and dfu-util is not even nas related, so it does not really belong in this task)
Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>