Fix geopmhash example command line tool.
Fix geopmhash example command line tool.

- Remove help message documenting hidden bits in internal region ids.
- Print region id in hex with 16 digits.

Change-Id: Ia4aa0ca1f6bd0f4ca720d94481e4400cae11ff25
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

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