dt-bindings: iio: imu: st_lsm6dsx: add lsm6dsop device bindings

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/501ff8187d2df584ec978c7e7ec5c445c3d0741c.1606642528.git.lorenzo@kernel.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/imu/st,lsm6dsx.yaml

@@ -30,6 +30,7 @@ properties:
       - st,lsm6ds0
       - st,lsm6dsrx
       - st,lsm6dst
+      - st,lsm6dsop
 
   reg:
     maxItems: 1