staging: comedi: addi_apci_1032: remove i_APCI1032_Read1DigitalInput()

This function is the insn_read operation for the digital input subdevice.
This operation can be emulated by the comedi core now that the insn_bits
operation follows the comedi API. Remove this now unnecessary function.

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