To my knowledge, you still have to select LNAV/VNAV minima, as the LPV is a different kind of approach, for which you need to have certain equipment(in this case, SBAS) and certain certifications/authorizations from the regulator that the A320. Even if the A320 onboard navigations systems are as precise as those in LPV approved aircraft, you're still legally restricted to LNAV/VNAV. Maybe in the future Airbus incorporates this requirements and thus A320s will be able to perfomr LPV approaches.