hwmon: (it87) Add DMI table for future extensions

Add in DMI matching table to match various board quirks and settings.
This will be useful for future extentions, but will start with the
existing definition of the Shuttle SN68PT.

Signed-off-by: Frank Crawford <frank@crawford.emu.id.au>
Link: https://lore.kernel.org/r/20221105232531.1619387-1-frank@crawford.emu.id.au


Signed-off-by: Guenter Roeck <linux@roeck-us.net>