Phosh: drop for now until hardware support is more useful
    
    Right now, the image will not really work on any mobile hardware due to
    lack of upstream kernel support. This is causing some confusion from
    users who expect it to work on a bunch of hardware.
    Until there's some kind of actual mobile reference hardware we can get
    our hands on that actually mostly works we shouldnt be producing the
    image.
    
    Hopefully it will be back someday. :)
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>