iio:accel:kxsd9 move out of staging

This is a very simple driver giving basic access to this part over an
spi bus.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 05e996f..d600353 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -14,4 +14,11 @@
 	  Say yes here to build support for the HID SENSOR
 	  accelerometers 3D.
 
+config KXSD9
+	tristate "Kionix KXSD9 Accelerometer Driver"
+	depends on SPI
+	help
+	  Say yes here to build support for the Kionix KXSD9 accelerometer.
+	  Currently this only supports the device via an SPI interface.
+
 endmenu