staging: comedi: vmk80xx: remove support for manual attaching

This comedi USB driver supports attaching with the auto config
mechanism. Remove the manual attaching support using the
COMEDI_DEVCONFIG ioctl.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>