radv,vulkan: add a new x11 wsi drirc workaround for DOOM Eternal

DOOM Eternal happily creates a swapchain with 2 images for IMMEDIATE.
This fixes a 10% performance issue with RADV.

Cc: 20.1 <mesa-stable@lists.freedesktop.org>
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/5704>
5 files changed