iio: buffer: Increase max buffer size from 4 MiB to 16 MiB

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
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>
drivers/iio/frequency/ad9517.c: "line" address should be compared with the start address of the "data" + size.