dt-bindings: fsi: ibm,i2cr-fsi-master: Reference common FSI controller

Remove the common properties from the I2CR documentation and instead
point to the common FSI controller documentation.
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240522192524.3286237-8-eajames@linux.ibm.comSigned-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/fsi/ibm,i2cr-fsi-master.yaml

@@ -26,7 +26,10 @@ required:
   - compatible
   - reg
 
-additionalProperties: false
+allOf:
+  - $ref: fsi-controller.yaml#
+
+unevaluatedProperties: false
 
 examples:
   - |