staging: comedi: cb_das16_cs: rename register map defines

For aesthetics, add _REG to all the register map offsets and convert
the values to hex.

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>