Remove call to real constructor in PowerBalancerAgentTest
Remove call to real constructor in PowerBalancerAgentTest

- This will attempt to use the real PlatformIO and PlatformTopo
  instead of mocks.
- This functionality is covered by integration tests.

Signed-off-by: Diana Guttman <98d11df29868673c9a01b97a41154316626a31b0@intel.com>
Change-Id: I8b1abd03e9e950ab63aa9860008b3752215c8680

cmcantalupo/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,geopm/geopm,geopm/geopm,cmcantalupo/geopm,geopm/geopm,geopm/geopm