Use RunHostCommandTargetPreparer to enable TAPL

Currently the flicker tests use the GoogleDeviceSetup to activate TAPL
and allow the launcher instrumentation to execute. This method, however
did not work under all conditions and resulted in b/153565763.

To fix this problem we now run the commands with RunHostCommandTargetPreparer.

Test: On a freshly flashed and wiped device run atest FlickerTests
Bug: 153565763
Change-Id: Ia5878ad9ca832be03d3ec3e1f93ca810db121706