The patch is not part of the kernel package itself, it is part of the
linux-firmware package, there was no new release of linux-firmware since I
tested this.

I think the reason why you did not have to rebuld the initramfs is that there
was no linux-firmware update, which would again put the raven_dmcu.bin file in
/lib/firmware/amdgpu/ folder and also in the initramfs, so you would need to
rename/move it again and run dracut to rebuild the initramfs.

once a new version of linux-firmware comes out (with the patch) I will re-test
and report results here.