Documentation: dt: iio: imu: st_lsm6dsx: add lsm6dsl sensor device binding

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt

@@ -3,6 +3,7 @@
 Required properties:
 - compatible: must be one of:
   "st,lsm6ds3"
+  "st,lsm6dsl"
   "st,lsm6dsm"
 - reg: i2c address of the sensor / spi cs line