dt-bindings: mfd: qcom,spmi-pmic: Allow RRADC as adc@ subnode

This was omitted when adding the RRADC bindings.

Fixes: 7ea58c95 ("dt-bindings: iio: adc: document qcom-spmi-rradc")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230213201337.2089970-1-konrad.dybcio@linaro.org

Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml

@@ -115,6 +115,7 @@ patternProperties:
     type: object
     oneOf:
       - $ref: /schemas/iio/adc/qcom,spmi-iadc.yaml#
+      - $ref: /schemas/iio/adc/qcom,spmi-rradc.yaml#
       - $ref: /schemas/iio/adc/qcom,spmi-vadc.yaml#
 
   "^adc-tm@[0-9a-f]+$":