dt-bindings: adc: ad9467: support new parts

Add support for new devices:
 * Analog Devices AD9652 16-bit 310 MSPS ADC;
 * Analog Devices AD9643 14-Bit, 170/210/250 MSPS ADC;
 * Analog Devices AD9649 14-bit 20/40/65/80 MSPS ADC.

Note all these parts have subtle differences in their programming model
(different scales, number of channels, etc..) so fallbacks are not
possible.

Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240704-dev-iio-ad9467-new-devs-v1-4-f1adfee921f7@analog.com


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