Fix frequency map agent test
Fix frequency map agent test

- The default frequency was the max frequency, but the assertions
  assumed sticker.
- Changed the default to sticker so that we know that the processor
  can achieve it.
- Added barriers between regions.

Signed-off-by: Brad Geltz <e42f3ad4099980ea02f08e076efbee5cf9d4a803@intel.com>
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

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