Is it possible to utilize Zynq in a PL-only configuration?
Create an FSBL for the board (FSBL is needed for loading the bitstream). If you already have an SDK project for this board for any reference design (just make sure the reference design has the SD interface included. Chances are the ref design already has all peripherals included), Open the SDK project and make sure there is an FSBL SDK software project. If not create one.
Edit your fsbl.h file, add the following line and make sure SDK rebuilds the FSBL project (saving the file might not rebuild the fsbl.elf file, so run rebuild).