x86/resctrl: Support monitor configuration

Add a new field in struct mon_evt to support Bandwidth Monitoring Event
Configuration (BMEC) and also update the "mon_features" display.

The resctrl file "mon_features" will display the supported events
and files that can be used to configure those events if monitor
configuration is supported.

Before the change:

  $ cat /sys/fs/resctrl/info/L3_MON/mon_features
  llc_occupancy
  mbm_total_bytes
  mbm_local_bytes

After the change when BMEC is supported:

  $ cat /sys/fs/resctrl/info/L3_MON/mon_features
  llc_occupancy
  mbm_total_bytes
  mbm_total_bytes_config
  mbm_local_bytes
  mbm_local_bytes_config

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20230113152039.770054-9-babu.moger@amd.com