sensor.h: add new attributes

This patch as following attributes:
 * SENSOR_ATTR_OFFSET: for setting offsets in order to adjust the read
   values;
 * SENSOR_ATTR_CALIB_TARGET: for setting target that the chip internal
   algorithms need to converge to when calibrating;

Change-Id: I3aae5aa06bcd1376423e58b0511267ea43038718
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
1 file changed