dt-bindings: iio: accel: add LIS3DHH device bindings

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

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

@@ -47,6 +47,7 @@ Accelerometers:
 - st,lng2dm-accel
 - st,lis3l02dq
 - st,lis2dw12
+- st,lis3dhh
 
 Gyroscopes:
 - st,l3g4200d-gyro