dts: bindings: adc: microchip: mcp320x: use common io-channel-cells name

Use the common io-channel-cells name "input" instead of "channel" to make
this binding work with the various ADC DT macros.

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

dts/bindings/adc/microchip,mcp320x-base.yaml

@@ -7,4 +7,4 @@ properties:
     const: 1
 
 io-channel-cells:
-  - channel
+  - input