When used in 'mbm_event' mode, ABMC emulation, resctrl uses arch hooks to read and reset the memory bandwidth utilization (MBWU) counters. Add these. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Ben Horgan <ben.horgan@arm.com> Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Tested-by: Fenghua Yu <fenghuay@nvidia.com> Tested-by: Gavin Shan <gshan@redhat.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Reviewed-by: Fenghua Yu <fenghuay@nvidia.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Signed-off-by: Will Deacon <will@kernel.org>