[PATCH 25/33] arm_mpam: Add helpers to allocate monitors

[Shaopeng Tan (Fujitsu)]

> From: James Morse <james.morse at arm.com>
> 
> MPAM's MSC support a number of monitors, each of which supports
> bandwidth counters, or cache-storage-utilisation counters. To use a counter, a
> monitor needs to be configured. Add helpers to allocate and free CSU or MBWU
> monitors.
> 
> Signed-off-by: James Morse <james.morse at arm.com>
> Reviewed-by: Ben Horgan <ben.horgan at arm.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron at huawei.com>
> Tested-by: Fenghua Yu <fenghuay at nvidia.com>
> Tested-by: Shaopeng Tan <tan.shaopeng at jp.fujitsu.com>
> Tested-by: Peter Newman <peternewman at google.com>
> Signed-off-by: Ben Horgan <ben.horgan at arm.com>

Reviewed-by: Shaopeng Tan <tan.shaopeng at jp.fujitsu.com>