meminfo: Show reliable memory info

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4PM01


CVE: NA

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Add ReliMemTotal & ReliMemUsed in /proc/meminfo to show memory info about
reliable memory.

- ReliableTotal: total reliable RAM

- ReliableUsed: thei used amount of reliable memory kernel

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>