staging: IIO: DAC: Add support for the AD5543/AD5553

Add support for the AD5543/AD5553 SPI 16-/14-Bit DACs
Fix typo in kconfig description

Changes since V1:
reorder Kconfig help text

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
3 files changed