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You will need to make your PS pins accessible to the PL by routing them to the PL using the EMIO pins. After making them EMIO and saving your configurations right click on the uart pins in the block design and select make external. After making them emio and external you will have to write constraints to send them to the correct pins your external uart device is targeting.
Here are some references Redirecting Peripherals from MIO to EMIO | Zedboard
Note: Some of the reference above target old tools.