dt-bindings:iio:qcom-spmi-vadc drop incorrect io-channel-ranges from example

io-channel-ranges is a property for io-channel consumers. Here
it is in an example of a provider of channels so doesn't do anything
useful.

Recent additions to dt-schema check this property is only provided
alongside io-channels which is not true here and hence an error is
reported.

Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Jishnu Prakash <jprakash@codeaurora.org>
Link: https://lore.kernel.org/r/20201115192951.1073632-2-jic23@kernel.org

Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml

@@ -48,8 +48,6 @@ properties:
     description:
       End of conversion interrupt.
 
-  io-channel-ranges: true
-
 required:
   - compatible
   - reg
@@ -249,7 +247,6 @@ examples:
         #address-cells = <1>;
         #size-cells = <0>;
         #io-channel-cells = <1>;
-        io-channel-ranges;
 
         /* Channel node */
         adc-chan@39 {