UBUNTU:SAUCE: Documentation: dt: iio: accel: add lng2dm sensor device binding

BugLink: http://bugs.launchpad.net/bugs/1650112Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(cherry picked from commit 1fbf1481)
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

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

@@ -42,6 +42,7 @@ Accelerometers:
 - st,lsm303agr-accel
 - st,lis2dh12-accel
 - st,h3lis331dl-accel
+- st,lng2dm-accel
 
 Gyroscopes:
 - st,l3g4200d-gyro