dt-bindings: iio: io-channel-mux: Fix compatible string in example code

The correct compatible string is "gpio-mux" (see
bindings/mux/gpio-mux.txt).

Cc: [email protected] # v4.13+
Reviewed-by: Peter Rosin <[email protected]>
Signed-off-by: Christian Eggers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>

Author: ceggers-arri

Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt

@@ -21,7 +21,7 @@ controller state. The mux controller state is described in
 
 Example:
 	mux: mux-controller {
-		compatible = "mux-gpio";
+		compatible = "gpio-mux";
 		#mux-control-cells = <0>;
 
 		mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,