staging: comedi: adv_pci_dio: use common defines for PCI-1739/175[01] registers

These boards use the same offsets for the interrupt control registers.
For aesthetics, remove the current defines and use common ones.

Fix the switch() in pci_dio_reset() to use common code.

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>