Blame SPECS/06-8c-01_disclaimer

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Microcode updates for Intel Tiger Lake-UP3/UP4 (family 6, model 140, stepping 1;
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CPUID 0x806c1) are disabled as they may cause system instability.
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Please refer to /usr/share/doc/microcode_ctl/caveats/06-8c-01_readme
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and /usr/share/doc/microcode_ctl/README.caveats for details.