dt-bindings: hwmon: temperature: add support for EMC1812

dt-bindings: hwmon: temperature: add support for EMC1812

This is the devicetree schema for Microchip EMC1812/13/14/15/33
Multichannel Low-Voltage Remote Diode Sensor Family. It also
updates the MAINTAINERS file to include the new driver.

EMC1812 has one external remote temperature monitoring channel.
EMC1813 has two external remote temperature monitoring channels.
EMC1814 has three external remote temperature monitoring channels and
channels 2 and 3 support anti parallel diode.
EMC1815 has four external remote temperature monitoring channels and
channels 1/2  and 3/4 support anti parallel diode.
EMC1833 has two external remote temperature monitoring channels and
channels 1 and 2 support anti parallel diode.
Resistance Error Correction is supported on channels 1/2 and 3/4.

Signed-off-by: Marius Cristea <marius.cristea@microchip.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20260610-hw_mon-emc1812-v11-1-cef809af5c19@microchip.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>