arm64/mpam: resctrl: Support cdp on monitoring data

hulk inclusion
category: feature
feature: ARM MPAM support
bugzilla: 48265
CVE: NA

--------------------------------

commit 43be0de7be8f ("arm64/mpam: Support cdp on allocating monitors")
allows us to allocate two monitor once, we apply this two monitors to
different monitor sysfile under mon_data directory according to its'
closid, as following illustrates.

-- resctrl/
         +-- schemata
             L3CODE:0=xx  # closid
             L3DATA:1=xx  # closid+1
             MB:0=xx      # closid
         +-- mon_data/
                    +-- mon_L3CODE_00 # monitor
                    +-- mon_L3DATA_00 # monitor+1
                    +-- mon_MB_00     # monitor

When monitoring happens, we read the private data of each monitor
sysfile which contains closid, monitor and pmg, this is used for
obtaining monitor data.

Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>