x86/resctrl: Fix remaining kernel-doc warnings

x86/resctrl: Fix remaining kernel-doc warnings

The kernel test robot reported kernel-doc warnings here:

  arch/x86/kernel/cpu/resctrl/rdtgroup.c:915: warning: Function parameter or member 'of' not described in 'rdt_bit_usage_show'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:915: warning: Function parameter or member 'seq' not described in 'rdt_bit_usage_show'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:915: warning: Function parameter or member 'v' not described in 'rdt_bit_usage_show'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1144: warning: Function parameter or member 'type' not described in '__rdtgroup_cbm_overlaps'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1224: warning: Function parameter or member 'rdtgrp' not described in 'rdtgroup_mode_test_exclusive'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1261: warning: Function parameter or member 'of' not described in 'rdtgroup_mode_write'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1261: warning: Function parameter or member 'buf' not described in 'rdtgroup_mode_write'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1261: warning: Function parameter or member 'nbytes' not described in 'rdtgroup_mode_write'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1261: warning: Function parameter or member 'off' not described in 'rdtgroup_mode_write'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1370: warning: Function parameter or member 'of' not described in 'rdtgroup_size_show'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1370: warning: Function parameter or member 's' not described in 'rdtgroup_size_show'
  arch/x86/kernel/cpu/resctrl/rdtgroup.c:1370: warning: Function parameter or member 'v' not described in 'rdtgroup_size_show'

The first two functions are missing an argument description while the
other three are file callbacks and don't require a kernel-doc comment.

Closes: https://lore.kernel.org/oe-kbuild-all/202310070434.mD8eRNAz-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Newman <peternewman@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20231011064843.246592-1-maciej.wieczor-retman@intel.com