shmem: Introduce shmem reliable

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S


CVE: NA

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This feature depends on the overall memory reliable feature.
When the shared memory reliable feature is enabled, the pages
used by the shared memory are allocated from the mirrored
region by default. If the mirrored region is insufficient,
you can allocate resources from the non-mirrored region.

Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>