The VCU is only available in EV devices. EV devices have a number of VCCINT_VCU power pins that correspond to ground pins on the CG and EG devices. If moving from a CG or EG to an EV device, the corresponding pins (VCCINT_VCU) should remain grounded if the VCU is not used.
IMPORTANT: A feasible migration path only exists for moving from an EV device to a CG/EG device. To go to an EV device from a CG/EG device, the PCB would need to be modified substantially to add the regulator for VCCINT_VCU.