dt-bindings: hwmon: (mr75203) fix "intel,vm-map" property to be optional

Change "intel,vm-map" property to be optional instead of required.

The driver implementation indicates it is not mandatory to have
"intel,vm-map" in the device tree:
 - probe doesn't fail in case it is absent.
 - explicit comment in code - "Incase intel,vm-map property is not
   defined, we assume incremental channel numbers".

Fixes: 748022e ("hwmon: Add DT bindings schema for PVT controller")
Signed-off-by: Eliav Farber <[email protected]>
Acked-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: Eliav Farber

Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml

@@ -48,7 +48,6 @@ required:
   - compatible
   - reg
   - reg-names
-  - intel,vm-map
   - clocks
   - resets
   - "#thermal-sensor-cells"