For PS7 IP cores, specifying the preset configuration is the same as any other supported IP in the catalog. The <user_parameters> must name the various preconfigured properties and their values in the preset_file.
<ip_preset preset_proc_name="ps7_preset">
<ip vendor="xilinx.com" library="ip" name="processing_system7" version="*">
<user_parameters>
<user_parameter name="CONFIG.preset" value="ZC702"/>
<user_parameter name="CONFIG.PCW_CAN0_PERIPHERAL_ENABLE" value="0"/>
</user_parameters>
</ip>
</ip_preset>