staging: comedi: adv_pci1710: rename interrupt helper functions

For aesthetics, rename the helper functions that are called by
the interrupt function to handle reading the analog input samples.

Also, change the parameters to the helpers to the comedi_device
and comedi_subdevice pointers.

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>