BugLink: http://bugs.launchpad.net/bugs/1650112

add support to STMicroelectronics LNG2DM accelerometer to
st_accel framework
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(cherry picked from commit dcdb0a78)
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>