dt-bindings: iio: adc: Add common-mode-channel property

There are ADCs that are differential but support to measure single-ended
signals on the same channels by connecting a constant voltage to the
negative input pin.

This property allows to properly define a single-ended channel that
requires two inputs to be specified. Software can use the presence of
this property to mark the channel as not differential.

Reviewed-by: Conor Dooley <[email protected]>
Signed-off-by: Dumitru Ceclan <[email protected]>
Reviewed-by: Nuno Sa <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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