staging: comedi: ssv_dnp: remove boardinfo

This driver only supports a single "boardtype". Remove the unneeded
boardinfo struct and its use in the driver. Change the "driver_name"
to match what the boardinfo supplied.

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>