staging: iio: new ADT7316/7/8 and ADT7516/7/9 driver

IIO driver for temperature sensor, ADC and DAC devices over SPI and I2C.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile
index e909674..0111647 100644
--- a/drivers/staging/iio/Makefile
+++ b/drivers/staging/iio/Makefile
@@ -11,6 +11,7 @@
 
 obj-y += accel/
 obj-y += adc/
+obj-y += addac/
 obj-y += gyro/
 obj-y += imu/
 obj-y += light/