Fix issues in sensor target test

  * Less suceptible to lingering sensor activation before system
    restarts.
  * Covers injectSensorEvent and setOperationMode API
  * More test cases to test various operation conditions.

Bug: 32022776
Bug: 33618936
Test:  vts-tradefed run commandAndExit vts --module VtsHalSensorsV1_0Target

Change-Id: I75f585a373880e831f511784a856d322077c07c0