staging: comedi: addi_apci_1032: cleanup v_ADDI_Interrupt()

There is no need for this function to call v_APCI1032_Interrupt()
in hwdrv_apci1032.c to reset the board. Just move the code from
v_APCI1032_Interrupt() directly into this function.

Rename the CamelCase function to apci1032_interrupt().

Rename the CamelCase local variable used to read/write the control
register.

Change the return from IRQ_RETVAL(1) to IRQ_HANDLED.

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>