radv: Disable coherent L2 optimization on cards with noncoherent L2.

radv: Disable coherent L2 optimization on cards with noncoherent L2.

With high likelihood we are forgetting to set the noncoherent bits
somewhere but I don't have the HW to debug. To avoid user pain
disable this optimization on these GPUs.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5505
Fixes: fd8210f27ed ("radv: Try to do a better job of dealing with L2 coherent images.")
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13620>