Revert "docs: Update documentation to reflect what TAINT_CPU_OUT_OF_SPEC means"

Intel inclusion
category: feature
feature: Backport Intel In Field Scan(IFS) multi-blob images support
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I6L337


CVE: N/A
Reference: N/A

Intel-SIG: Revert commit 75d4e3f5 ("docs: Update documentation to
reflect what TAINT_CPU_OUT_OF_SPEC means")

-------------------------------------

This reverts commit 75d4e3f5.

This revert is to re-enable microcode late loading.

Signed-off-by: Aichun Shi <aichun.shi@intel.com>