staging:iio: Move adxrs450 driver out of staging

The adxrs450 is in a reasonable shape now. It follows the IIO ABI and non of the
standard code checker tools report any issue, so move it out of staging.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/gyro/Makefile b/drivers/iio/gyro/Makefile
index 66b517d..eff9bb0 100644
--- a/drivers/iio/gyro/Makefile
+++ b/drivers/iio/gyro/Makefile
@@ -4,6 +4,8 @@
 
 obj-$(CONFIG_ADIS16080) += adis16080.o
 obj-$(CONFIG_ADIS16136) += adis16136.o
+obj-$(CONFIG_ADXRS450) += adxrs450.o
+
 obj-$(CONFIG_HID_SENSOR_GYRO_3D) += hid-sensor-gyro-3d.o
 
 obj-$(CONFIG_IIO_ST_GYRO_3AXIS) += st_gyro.o