Make interrupt registration functions take named constants for
polarity and trigger mode.  Old -> new magic decoder ring:
polarity 0 -> IOSAPIC_POL_LOW(#defined to 1)
polarity 1 -> IOSAPIC_POL_HIGH(#defined to 0)
trigger 0  -> IOSAPIC_LEVEL(#defined to 1)
trigger 1  -> IOSAPIC_EDGE(#defined to 0)