radv: fix fast clearing depth-only or stencil-only aspects with HTILE

radv: fix fast clearing depth-only or stencil-only aspects with HTILE

DB isn't coherent with L2 on GFX6-8. This is needed when the
clear HTILE mask path is selected.

This fixes an issue with avatars in Heroes of The Storm.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3362
Cc: 21.1 mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10277>