fix: preserve FP8 llmc metadata for mxfp8 (#1861)
Signed-off-by: yiliu30 <yi4.liu@intel.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
