Fix handling of reportToken when stopping

VTS should ignore the reportToken returned by configDirectReport when it
passes in RateLevel::STOP.

Bug: 138758242
Test: run direct channel tests on device using 2.0 HAL
Change-Id: I07e789157e051ceab488a61e856f17d50f435072
Merged-In: I07e789157e051ceab488a61e856f17d50f435072
(cherry picked from commit 63d4f579)