dt-bindings: iio: dac: Fix AD5686 references

The example and filename use 'adi,ad5686', but the schema doesn't
document it. The AD5686 is also a SPI interface variant while all the
documented variants have an I2C interface. So let's update all the
references to AD5686 to AD5696.

Cc: Lars-Peter Clausen <[email protected]>
Cc: Michael Hennerich <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Michael Auchter <[email protected]>
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Acked-by: Lars-Peter Clausen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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