radeonsi/vcn: Change required FW version for rc_per_pic_ex on VCN3
What does this MR do and why?
radeonsi/vcn: Change required FW version for rc_per_pic_ex on VCN3
It only works correctly on 29 and newer.
Also change the old FW message to one time warning.
Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12353