dt-bindings: iio: dac: ti,dac5571: Add DAC081C081 support

The DAC081C081 is a TI DAC whose software interface is compatible with
the DAC5571. It is the 8-bit version of the DAC121C081, already
supported by the DAC5571 bindings. Extends the bindings to support this
chip.

Signed-off-by: Laurent Pinchart <[e-mail]>
Reviewed-by: Sean Nyekjaer <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

Documentation/devicetree/bindings/iio/dac/ti,dac5571.yaml

···
       - ti,dac5573
       - ti,dac6573
       - ti,dac7573
+      - ti,dac081c081
       - ti,dac121c081
 
   reg: