mm: Enable reliable memory for x86 platform

Intel inclusion
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I7HV16


CVE: NA

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Intel-SIG: Enable reliable memory for x86 platform

Currently reliable memory is only enabled for ARM64 platform. Hardware
on Intel platform also support this feature, so enable it for x86.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>