dt-bindings:iio:samsung, exynos-adc: drop missuse of io-channel-ranges

io-channel-ranges is a property for consumers of io-channels, not
providers.  Hence it is not relevant in this binding or the examples
given.

Recent changes to dt-schema result in this being reported as an error
as a dependency is enforced between this property and io-channels.
Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201115192951.1073632-3-jic23@kernel.org

Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml

@@ -49,8 +49,6 @@ properties:
   "#io-channel-cells":
     const: 1
 
-  io-channel-ranges: true
-
   vdd-supply: true
 
   samsung,syscon-phandle:
@@ -130,7 +128,6 @@ examples:
         reg = <0x12d10000 0x100>;
         interrupts = <0 106 0>;
         #io-channel-cells = <1>;
-        io-channel-ranges;
 
         clocks = <&clock 303>;
         clock-names = "adc";
@@ -156,7 +153,6 @@ examples:
         reg = <0x126C0000 0x100>;
         interrupts = <0 137 0>;
         #io-channel-cells = <1>;
-        io-channel-ranges;
 
         clocks = <&cmu CLK_TSADC>,
                  <&cmu CLK_SCLK_TSADC>;