Fix synchronization of THMULTI DivSqrt lanes when FP16ALT or FP8 are enabled
This PR fixes the synchronization of THMULTI DivSqrt lanes when FP16ALT or FP8 are enabled. By applying this fix, the synchronization mechanism does not wait for the FP16ALT or FP8 units to be ready (these are not instantiated when selecting THMULTI for the DivSqrt support).