i2c: i801: Fix the Intel Diamond Rapids features

i2c: i801: Fix the Intel Diamond Rapids features

Diamond Rapids does not support the iTCO feature.
Adding also the missing comment describing Diamond
Rapids while at it.

Fixes: 084cbc58e720 ("i2c: i801: Add support for Intel Diamond Rapids")
Reported-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20251028105342.2281687-1-heikki.krogerus@linux.intel.com