staging: comedi: amplc_dio200: remove DIO200_DRIVER_NAME

Remove the `DIO200_DRIVER_NAME` macro which expands to the driver name
"amplc_dio200".  Use the board name from our `struct dio200_board` when
requesting resources.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>