[IMU_Cal] Runtime sensor calibration code update.

This code updates all of the refactored changes developed and
tested in Google3. This update includes setting calibration
accuracy level.

Tip of G3 CL: 195047378
Bug: 75333210 (refactor updates)
Bug: 75335561 (calibration accuracy)
Test: ./load_app.sh and verified calibrations on device.

Change-Id: I48bd61b6610a7cc7ce9a88bfdde51552c509d763