input: sensors: add bma2x2 accelerometer self calibration

The self calibration can be used for factory test, and the sensor
can calibrate by itself, the clibration data store in sensor eeprom.

CRs-fixed: 668548
Change-Id: If237224c75ba948a26d96746ade68c478e2ed4e0
Signed-off-by: Oliver Wang <mengmeng@codeaurora.org>