q800: wire up remaining IRQs in classic mode

q800: wire up remaining IRQs in classic mode

Explicitly wire up the remaining IRQs in classic mode to enable the use of
g_assert_not_reached() in the default case to detect any unexpected IRQs.

Add a comment explaining the IRQ routing differences in A/UX mode based
upon the comments in NetBSD (also noting that at least A/UX 3.0.1 still
uses classic mode).

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211020134131.4392-8-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>