Fix issue with ACNT and MCNT msr aggregation
Fix issue with ACNT and MCNT msr aggregation

- Aggregation method was not specified in json description.
- Default is "select_first", which is not correct in this case.
- Set aggration to sum which is the type for all counters.
- Fixes #1737 from github issues.

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

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