staging: comedi: aio_iiro_16: fix subdevice 1 'type'

Subdevice 1 is a digial input not a digital I/O subdevice.

Fix the type and, for aesthetics, rename the (*insn_bits) function used
to read the inputs.

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>

diff --cc drivers/staging/comedi/drivers/aio_iiro_16.c
Simple merge