iio: Restore alphabetic order in Makefile

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index a0547f5..bcf7e9e 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -21,6 +21,6 @@
 obj-y += imu/
 obj-y += light/
 obj-y += magnetometer/
+obj-y += pressure/
 obj-y += temperature/
 obj-y += trigger/
-obj-y += pressure/