Adding rate independency test for sensor direct report

Adding tests to verify rate independency,

  * between different sensors in one single channel.
  * between sensors in different channel.
  * between direct report and traditional poll report.

A few tests are added to known-failure list before various criteria
are finalized.

Test: test device passed SensorDirectReportTest
Bug: 38420898

Change-Id: If9b30025dfb8d6ff2798efe0b65288e3cb39c006
Merged-In: If9b30025dfb8d6ff2798efe0b65288e3cb39c006
2 files changed