staging: comedi: addi_apci_2032: remove the timer s->range_table

The timer subdevice does not have a digital range. Its range of
0 to 0xff is the value used to set the reload timer.

Remove the setting of s->range_table. The comedi core will then
set it to range_unknown.

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>