Yet another rework of the crucial gio_id() function responsible for correctly

recognizing a GIO device or an id-less frame buffer in a GIO slot.

Turns out that GIO32 devices (at least those with a 32-bit ID register, but
likely all of them) do NOT like accesses to the minimal GIO register area
NOT done on 32-bit boundaries. While frame buffers won't mind, especially
if their slots are pipelined.

This makes it a lot easier to tell them apart.

While there, split gio_intr_establish() into gio_intr_map(), which will return
a logical interrupt number out of a GIO slot number, and gio_intr_establish(),
which will now expect a logical interrupt number, instead of a logical slot
number. These two functions are still unused, but upcoming changes depend on
this work. (Yes, I'm too lazy to make two commits for this tonite)

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