The PKGBUILD points to hackrf-2023.01.1.tar.xz

Once downloaded we have the following in firmware/cpld/README:
This is a binary file built from HDL source in sgpio_if. You do not need
Xilinx tools unless you want to make your own modifications.

So the easiest way to fix this package is to generate a cleaned up tarball with the various firmwares removed and also not ship the firmwares unless we build them ourselves.