m68knommu: Document supported chips in intc-2.c and intc-simr.c.

The chips lists were in commit logs, but should also be in source files.
This way it is easier to choose the right source file for a not yet
supported Coldfire.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
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