drirc: enable vk_x11_override_min_image_count for DOOM

DOOM fails to handle more images than expected when the adaptative
sync mode is enabled.

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/1902


Cc: 19.2 <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit ad96c498)