hwmon: (it87) Allow multiple chip IDs for force_id

Extend the force_id module parameter to allow specifying one or both
chip IDs separately.  If only a single parameter is given it defaults
to using that value for all chips, similar to previous usage.

Signed-off-by: Frank Crawford <frank@crawford.emu.id.au>
Link: https://lore.kernel.org/r/20230128060308.1549707-6-frank@crawford.emu.id.au
Signed-off-by: Guenter Roeck <linux@roeck-us.net>