perf/pmu-events/powerpc: Update json mapfile with Power11 PVR

Update the Power11 PVR to json mapfile to enable
json events. Power11 is PowerISA v3.1 compliant
and support Power10 events.

Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Reviewed-by: Kajol Jain <kjain@linux.ibm.com>
Cc: atrajeev@linux.vnet.ibm.com
Cc: disgoel@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240129120855.551529-1-maddy@linux.ibm.com