staging: comedi: drivers: remove unnecessary DRIVER_NAME defines

These defines are usually only used to initialize the driver_name
member of the comedi_driver struct. Some of the drivers also use
the define as part of dev_{level}() messages and/or when doing a
request_irq().

The addition of the DRIVER_NAME to the messages is just added noise
and the dev->board_name is typically used in the request_irq().

Just remove all the DRIVER_NAME defines.

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