dt-bindings: iio: adc: add ti,ads1119

Add devicetree bindings for Texas Instruments ADS1119 16-bit ADC
with I2C interface.

Datasheet: https://www.ti.com/lit/gpn/ads1119


Signed-off-by: João Paulo Gonçalves <joao.goncalves@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20240617183215.4080-2-francesco@dolcini.it


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