Disable ZTurn's MIO pull-up on ULPI Lines
The pull-ups on the MIO pins for the ULPI lines connected to the USB3320 chip are enabled in the ZTurn. This can conflict with the "safe startup" pull-downs inside the USB3320 and cause problems with initialization. This can explain the issues we've been having with USB communication.
The MicroZed board files for Vivado disable these pull-ups by default. This MR does the same for the ZTurn projects.
References
Edited by Karol Krizka