These are just version 4 (random) UUIDs to use as FMP GUIDs.
This change was generated with the following command:
find models/ -name edk2.config -exec bash -c 'echo -e "\n# FMP UUIDs for ESRT\nSYSTEM_FMP_UUID=$(uuidgen -r)\nEC_FMP_UUID=$(uuidgen -r)" >> {}' \;
And then staged for everything except QEMU.
Signed-off-by: Tim Crawford <tcrawford@system76.com>