Improve fairness of Sensor Timestamp Jitter Test

  1. The threshold is calculated based on the "asked" sensor rate to
     avoid failures that caused by actual sensor rate being bumpped up.
  2. Estimation of the true center is no longer necessary. The range of
     timestamp interval is tested against 2x of the allowed single-sided
  3. The top and bottom 2.5% of timestamp interval samples are excluded
     from evaluation. This conform to previously used 95 percentile
     rule, yet is slightly different in terms of implementation.

Related bug:
  *  b/23430923
  *  b/23948014

Change-Id: I1f444514c2df63129d9e0ce404afe3ae7ae46eb0
3 files changed