dt-bindings: iio: temperature: ltc2983: require 4 wire rtd for current rotate

The driver will error out when current rotation is enabled but the RTD
is not 4-wire. Require it in the binding too.

Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221103130041.2153295-8-demonsingur@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>