[fedora-arm] RPI4 8G with UEFI for Pi: How to enable VC4?

Fedora 33 Workstation on the RPI4 with UEFI runs fine for me. However, I can't figure out how to get accelerated video working. Without UEFI, Fedora 33 with kernel 5.10.7 seems to enable accelerated video without any further configuration. There is a /boot/efi/config.txt in this case. It contains things like

gpu_mem=32
start_x=1
upstream_kernel=1
dtoverlay=upstream
mask_gpu_interrupt1=0x100

Where would one put these setttings for UEFI boot?

Thanks.
Eberhard
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