staging: comedi: addi_apci_1032: cleanup the register map defines

For aesthetic reasons, rename the defines used for the register map
so they are a bit shorter.

Define, and use, the bits in the interrupt control register.

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>