Local geomagnetic field update to sensor

Local geomagnetic field strength, declination, inclination information
is useful for magnetometer calibration. It also benefits rotation
vector sensor implementation as it gives a baseline that aids detecting
magnetic field disturbance.

Bug: 30958130
Test: Tested with marlin. Modified hal implementation can get local
      geomagnetic field.

Change-Id: I373fe74d5a091a3adb80ff3c61e441edcf5a253b