Add AMD fam15h northbridge event to ctests/perf_event_uncore_lib.c
Add AMD fam15h northbridge event to ctests/perf_event_uncore_lib.c

arm-hpc/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi