Add device tree bindings for the ADMV1013 Upconverter. Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20211221112206.97066-2-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>