Move main function out of namespace

Bug: 135473483
Test: adb shell /data/local/tmp/VtsHalPowerStatsV1_0TargetTest \
      --list_registered_services
Test: vts-tradefed run vts -m VtsHalPowerStatsV1_0Target
Change-Id: I01084afbf48cff268288a8cce23328a2e4d1e4a0
1 file changed