sw64: implement a new policy of power management

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XTK7



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In the previous commit, we prefer to use efi runtime function hooks
as default power management ops, it may raise unexpected errors at
virtual machine application. So in this commit we make the legacy
power management module built in the kernel, which may be used by
some guest os kernel under some circumstances when running without
efi loader support.

Signed-off-by: Dai Xin <daixin@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>