fs/resctrl: Pass struct rdtgroup instead of individual members

fs/resctrl: Pass struct rdtgroup instead of individual members

Reading monitoring data for a monitoring group requires both the RMID and
CLOSID. The RMID and CLOSID are members of struct rdtgroup but passed
separately to several functions involved in retrieving event data.

When "mbm_event" counter assignment mode is enabled, a counter ID is required
to read event data. The counter ID is obtained through mbm_cntr_get(), which
expects a struct rdtgroup pointer.

Provide a pointer to the struct rdtgroup as parameter to functions involved in
retrieving event data to simplify access to RMID, CLOSID, and counter ID.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
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/cover.1757108044.git.babu.moger@amd.com