Revision 2749

This patch rewrites probe_superio almost completely.
Common code sequences have been factored out, the code has been made
more generic, has better handling of corner cases and is actually much
shorter.

It also adds probing for almost all recent (since 1999) ITE Super I/O
chips to probe_superio. I did verify against all ITE datasheets
(including those not available any more) that the probing was
non-destructive.

For the ITE IT8712F, the complete configuration is dumped and as
comparison the default value from the data sheet is printed.
More information can be extracted easily, however this needs loads of
datasheet surfing.

This code has been tested extensively, dumping for other ITE chips will
follow as a separate patch.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>