dt-bindings: hwmon: ibm,p8-occ-hwmon: move to trivial devices

This binding meets the requirements to be converted to dtschema
via trivial-devices.yaml.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240322-hwmon_dtschema-v3-5-6697de2a8228@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: javiercarrascocruz

Documentation/devicetree/bindings/hwmon/ibm,p8-occ-hwmon.txt

@@ -126,6 +126,8 @@ properties:
           - ibm,cffps1
             # IBM Common Form Factor Power Supply Versions 2
           - ibm,cffps2
+            # IBM On-Chip Controller hwmon device
+          - ibm,p8-occ-hwmon
             # Infineon barometric pressure and temperature sensor
           - infineon,dps310
             # Infineon IR36021 digital POL buck controller