staging: comedi: addi-data: remove duplicate ADDIDATA_{ENABLE,DISABLE} defines

These are defined in addi_common.h, the hwdrv_* files do not need
to redefined them.

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>