mm/sharepool: Don't display sharepool statistics in the container

ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6HRGK



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The sharepool statistics record the sharepool memory information used
by all containers in the system. We do not expect to query the
sharepool memory information applied by processes in other containers
in the container.

Therefore, the sharepool statistics cannot be queried in the container
to solve this problem.

Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>