I know that AVDDx IOVDD of ADAU1962A supports 3.3V, can I make PLLVDD and DVDD also use 3.3V instead of 2.5V?
As you see in the datasheet, running the PLLVDD and DVDD at 3.3V is within its MAX voltage but not by much. If your 3.3V power supply happens to be 5% over nominal it will be at the MAX for the DVDD and PLLVDD. In addition, the power dissipation in the part will be greater and more chance for failures operating near the maximum voltage. So I would strongly recommend that you operate these at 2.5V. I suggest you use the internal regulator in the part with the external pass transistor so that timing of the power supplies are all handled by the part making your work easier.