The MST codepath is missing FEC readout. Add it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230502143906.2401-4-ville.syrjala@linux.intel.comReviewed-by: Luca Coelho <luciano.coelho@intel.com>