hwmon: mma8451: add fxo8700 accel support

The FXO8700 has a 3-axis accellerometer as well as a 3-axis magnetomoter.
This adds support for the 3-axis accellerometer.

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

Add accelerometer/magnetometer driver configuration

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