sw64: add dynamic turning on/off cores support

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56QDM



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This support must work together with dynamic frequency scaling, which
can dynamically turning on/off cores according to global system load.

Signed-off-by: Tang Jinyang <tangjinyang@wxiat.com>

Signed-off-by: Gu Zitao <guzitao@wxiat.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>