dt-bindings: iio: gyro: add L3GD20H sensor device binding

Signed-off-by: NLorenzo Bianconi <lorenzo.bianconi@st.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/iio/st-sensors.txt

@@ -52,6 +52,7 @@ Gyroscopes:
 - st,lsm330dl-gyro
 - st,lsm330dlc-gyro
 - st,l3gd20-gyro
+- st,l3gd20h-gyro
 - st,l3g4is-gyro
 - st,lsm330-gyro
 - st,lsm9ds0-gyro