These are normal and though annoying to see, generally are harmless. You might consider them to be placeholders for the kernel, that may include addition in the future. However, if you are anything like me... you may want to get it resolved and add the missing firmware.
This is easy to do- just download the needed firmware, elevate your file manager to Root and copy or move the needed files to /lib/firmware/amdgpu
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amdgpu
Further reading: