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

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Count reliable shmem usage based on NR_SHMEM.
Add ReliableShmem in /proc/meminfo to show reliable memory info
used by shmem.

- ReliableShmem: reliable memory used by shmem
Signed-off-by: NZhou Guanghui <zhouguanghui1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>