hwmon: (dell-smm) Add comment explaining usage of i8k_config_data[]

i8k_config_data[] should only be used for applying device specific
quirks in case autoconfig does not work properly on certain
devices.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20211021190531.17379-5-W_Armin@gmx.de


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