iio: dac: ad5592r: Ignore errors when reseting chip

This is required for the ad5593r; the I2C communication will stop as
soon as the chip is reseted, so the I2C master will trigger an error
that can safely be ignored.

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
iio: dac: Added ad5593r driver

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>