hwmon: mma8x5x: add support for FXOS8700

The FXOS8700 is a 3-axis accelerometer as well as a 3-axis magnemometer.
This adds support for the 3-axis accelerometer which shares the same
register configuration with the other mma8x5x parts.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
hwmon: mma8x5x: add FXOS8700 magnetometer support

The FXOS8700 contains a 3-axis magnetometer in addition to the
3-axis accelerometer.  This adds 2 additional linux input devices
required by the sensor HAL implemented by freescale in
hardware/imx/libsensors/MagSensor.cpp.

TODO: when changing from hybrid mode to accel_only mode the accelerometer
      stops updating.  Not sure how to overcome this yet so we always leave
      it in hybrid mode.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
imx6: ventana: add FXOS8700 support

Signed-off-by: Tim Harvey <tharvey@gateworks.com>