hwmon: (emc1403) Add support for EMC1428 and EMC1438.

EMC1428 and EMC1438 are similar to EMC14xx, but have eight temperature
channels, as well as signed data and limit registers. Chips currently
supported by this driver have unsigned registers only.

Signed-off-by: Lars Petter Mostad <larspm@gmail.com>
Link: https://lore.kernel.org/r/20240510142824.824332-1-lars.petter.mostad@appear.net


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