iio: Restore alphabetic order in Makefile

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/Makefile

@@ -21,6 +21,6 @@ obj-y += frequency/
 obj-y += imu/
 obj-y += light/
 obj-y += magnetometer/
+obj-y += pressure/
 obj-y += temperature/
 obj-y += trigger/
-obj-y += pressure/