mm: Drop shmem reliable related log during startup

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


CVE: NA

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Message "shmem reliable disabled." will be printed if memory reliable is
disabled. This is not necessary so drop it.

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