staging: comedi: addi_apci_3xxx: absorb v_APCI3XXX_Interrupt()

staging: comedi: addi_apci_3xxx: absorb v_APCI3XXX_Interrupt()

All the boards supported by this driver use the same 'interrupt'
callback in the boardinfo. Absorb the interrupt function from
hwdrv_apci3xxx.c directly into the driver. Rename the CamelCase
function to apci3xxx_irq_handler().

Remove v_ADDI_Interrupt(), which indirectly called the interrupt
function, and use apci3xxx_irq_handler instead when requesting
the irq. Remove the 'interrupt' callback from the boardinfo.

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>