Gyro Calibration

Gyro Calibration

Tries to detect steady state and computes bias based
on that detection.
Steadyness is detected by monitoring the gyro data for a fixed
number of events. If the data is extremely close it gathers the bias.
Theoretically, applying a constant rotation on all axes could also
provide very close data and that would provide a wrong bias but this is
not possible by human interaction with a mobile device (perhaps only
with an automated robotic solution).

Issue: GMIN-1185
Signed-off-by: Adriana Reus <adriana.reus@intel.com>
Change-Id: If1db69dcbda9c9c3b4434ac27ab500a199023f73

Conflicts:
	enumeration.c