[sensorfw] Add real calibration level to hybris compass sensor.

This makes the orientationfilter into a compassfilter, but not changing
the name. hybris calls it orientation sensor, even though it's
a calibrated compass.

The Jolla compass never seems to get above SENSOR_STATUS_ACCURACY_LOW, even after calibrated, but at least we know when its not calibrated and user needs to do the figure 8 calibration gesture.