Fix for MPI region entry.
Fix for MPI region entry.

- MPI regions used in GEOPM startup were given a region ID of 0.
- This change retries region ID lookup until it returns non-zero.

Change-Id: I3e42a3d62d9acf3cc4b892504c5635fc710fea99
Signed-off-by: Diana Guttman <98d11df29868673c9a01b97a41154316626a31b0@intel.com>

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