perf vendor events: Move PM_BR_MPRED_CMPL event for power10 platform

perf vendor events: Move PM_BR_MPRED_CMPL event for power10 platform

Move PM_BR_MPRED_CMPL event from cache.json to frontend.json file
for power10 platform

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Disha Goel <disgoel@linux.vnet.ibm.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20240827053206.538814-3-kjain@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>