arm64/mpam: update group flags only when enable sucsses

hulk inclusion
category: bugfix
bugzilla: 48265
CVE: NA

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

The ctrlcon flag should be set only when we sucessful to
enable ctrlmon, or the flag is mismatch with ctrlmon status.

ctrlmon is indicate a group which could moniter the usage
of L3/Memory bandwidth.

Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>